Questo e' il codice:
function show_search_form($select = 'filename') {
global $grants, $user_status, $font, $bordercolor, $headercolor, $classa,$classb,$backimg, $tablecolor, $mess, $phpExt, $q, $headerfontcolor;

echo " <table summary="" border="0" width="950" bgcolor="$bordercolor" cellpadding="4" cellspacing="1">
<tr>
<th align="left" class="$classa" bgcolor="$headercolor" valign="middle">
<font size="2" face="$font" color="$headerfontcolor"><b>$mess[224]</b></font></font>
</th>
</tr>
<td align="left" class="$classb" bgcolor="$tablecolor" valign="middle">
<font size="1" color="$normalfontcolor" face="$font">
<form action="search.${phpExt}?".SID."" method="post" style="margin: 0">
<input type="text" name="q" value="$q" class="vform" size=25> Ricerca Per:
<select name="action" class="vform">";
if($select == 'filename')
echo "
<option value="showsearchresults_byfilename" selected>Cognome</option>
<option value="showsearchresults_byall">Per nome</option>";

     else 
        echo " 
        <option value=\"showsearchresults_byfilename\">Cognome</option> 
        <option value=\"showsearchresults_byall\" selected>Per nome</option>"; 
     echo " 
     </select> 
  <input class=\"vform\" type=\"submit\" value=\"Cerca\" > 
        </form><br> 
        <table summary=\"\" border=\"0\" width=\"90%\" bgcolor=\"$bordercolor\" cellpadding=\"4\" cellspacing=\"1\"> 
   
       
        <font size=\"1\" color=\"$normalfontcolor\" face=\"$font\"> 
        </td> 
         
  </tr> 
  </table> 
 <br>"; 

}

devo solo inserire un alert in php,no javascript,possibilmente che se uno fa la ricerca senza inserire neppure una parola ,non viene accettata e appare la scritta inserisci almeno una parola!

tipo questo:

function controllo()
{
if (document.nomeform.nomecampo.value=="")
{
alert("Campo vuoto!")
return(false)
}

}

....pero la mia ignoranza non mi permettedi farlo!!
Grazie ancora!!

Allora php non centra nulla, il controllo è sempre javascript.
[php]
function show_search_form($select = 'filename') {
global $grants, $user_status, $font, $bordercolor, $headercolor, $classa,$classb,$backimg, $tablecolor, $mess, $phpExt, $q, $headerfontcolor;

echo " <table summary=\"\" border=\"0\" width=\"950\" bgcolor=\"$bordercolor\" cellpadding=\"4\" cellspacing=\"1\"> 
  <tr> 
    <th align=\"left\" class=\"$classa\" bgcolor=\"$headercolor\" valign=\"middle\"> 

<font size="2" face="$font" color="$headerfontcolor"><b>$mess[224]</b></font></font>
</th>
</tr>
<td align="left" class="$classb" bgcolor="$tablecolor" valign="middle">
<font size="1" color="$normalfontcolor" face="$font">
<form action="search.${phpExt}?".SID."" method="post" style="margin: 0">
<input type="text" name="q" value="$q" class="vform" size="25" onblur="if(this.value==""){alert('Inserisci almeno una parola');(this.value='Default';}"> Ricerca Per:
<select name="action" class="vform">";
if($select == 'filename')
echo "
<option value="showsearchresults_byfilename" selected>Cognome</option>
<option value="showsearchresults_byall">Per nome</option>";

     else 
        echo " 
        <option value=\"showsearchresults_byfilename\">Cognome</option> 
        <option value=\"showsearchresults_byall\" selected>Per nome</option>"; 
     echo " 
     </select> 
  <input class=\"vform\" type=\"submit\" value=\"Cerca\" > 
        </form><br> 
        <table summary=\"\" border=\"0\" width=\"90%\" bgcolor=\"$bordercolor\" cellpadding=\"4\" cellspacing=\"1\"> 
   
       
        <font size=\"1\" color=\"$normalfontcolor\" face=\"$font\"> 
        </td> 
         
  </tr> 
  </table> 
 <br>"; 

}
[/php]

Grazie ,ho provato ma mi da errore !!!
c'e' qualche variante!

Ho scordato 2 blackslash, prova cosi:
[php]
function show_search_form($select = 'filename') {
global $grants, $user_status, $font, $bordercolor, $headercolor, $classa,$classb,$backimg, $tablecolor, $mess, $phpExt, $q, $headerfontcolor;

echo " <table summary=\"\" border=\"0\" width=\"950\" bgcolor=\"$bordercolor\" cellpadding=\"4\" cellspacing=\"1\"> 
  <tr> 
    <th align=\"left\" class=\"$classa\" bgcolor=\"$headercolor\" valign=\"middle\"> 

<font size="2" face="$font" color="$headerfontcolor"><b>$mess[224]</b></font></font>
</th>
</tr>
<td align="left" class="$classb" bgcolor="$tablecolor" valign="middle">
<font size="1" color="$normalfontcolor" face="$font">
<form action="search.${phpExt}?".SID."" method="post" style="margin: 0">
<input type="text" name="q" value="$q" class="vform" size="25" onblur="if(this.value==""){alert('Inserisci almeno una parola');(this.value='Default';}"> Ricerca Per:
<select name="action" class="vform">";
if($select == 'filename')
echo "
<option value="showsearchresults_byfilename" selected>Cognome</option>
<option value="showsearchresults_byall">Per nome</option>";

     else 
        echo " 
        <option value=\"showsearchresults_byfilename\">Cognome</option> 
        <option value=\"showsearchresults_byall\" selected>Per nome</option>"; 
     echo " 
     </select> 
  <input class=\"vform\" type=\"submit\" value=\"Cerca\" > 
        </form><br> 
        <table summary=\"\" border=\"0\" width=\"90%\" bgcolor=\"$bordercolor\" cellpadding=\"4\" cellspacing=\"1\"> 
   
       
        <font size=\"1\" color=\"$normalfontcolor\" face=\"$font\"> 
        </td> 
         
  </tr> 
  </table> 
 <br>"; 

}
[/php]

In caso di errori, incollali sempre per intero in modo da poterli individuare facilmente.

e' in questa riga qui:*<select name="action" class="vform">"; *

<td align="left" class="$classb" bgcolor="$tablecolor" valign="middle">
<font size="1" color="$normalfontcolor" face="$font">
<form action="search.${phpExt}?".SID."" method="post" style="margin: 0">
<input type="text" name="q" value="$q" class="vform" size="25" onblur="if(this.value==""){alert('Inserisci almeno una parola');(this.value='Default';}"> Ricerca Per:
*<select name="action" class="vform">"; *
if($select == 'filename')
echo "

@alver said:

[***]

Aspetta che provo ,non avevo visto la reply!!
Mi sembra quasi una chat!
Grazie

Nel copia incolla sono scomparsi 2 backslash...
[php]
function show_search_form($select = 'filename') {
global $grants, $user_status, $font, $bordercolor, $headercolor, $classa,$classb,$backimg, $tablecolor, $mess, $phpExt, $q, $headerfontcolor;

echo " <table summary=\"\" border=\"0\" width=\"950\" bgcolor=\"$bordercolor\" cellpadding=\"4\" cellspacing=\"1\"> 
  <tr> 
    <th align=\"left\" class=\"$classa\" bgcolor=\"$headercolor\" valign=\"middle\"> 

<font size="2" face="$font" color="$headerfontcolor"><b>$mess[224]</b></font></font>
</th>
</tr>
<td align="left" class="$classb" bgcolor="$tablecolor" valign="middle">
<font size="1" color="$normalfontcolor" face="$font">
<form action="search.${phpExt}?".SID."" method="post" style="margin: 0">
<input type="text" name="q" value="$q" class="vform" size="25" onblur="if(this.value==""){alert('Inserisci almeno una parola');(this.value='Default';}"> Ricerca Per:
<select name="action" class="vform">";
if($select == 'filename')
echo "
<option value="showsearchresults_byfilename" selected>Cognome</option>
<option value="showsearchresults_byall">Per nome</option>";

     else 
        echo " 
        <option value=\"showsearchresults_byfilename\">Cognome</option> 
        <option value=\"showsearchresults_byall\" selected>Per nome</option>"; 
     echo " 
     </select> 
  <input class=\"vform\" type=\"submit\" value=\"Cerca\" > 
        </form><br> 
        <table summary=\"\" border=\"0\" width=\"90%\" bgcolor=\"$bordercolor\" cellpadding=\"4\" cellspacing=\"1\"> 
   
       
        <font size=\"1\" color=\"$normalfontcolor\" face=\"$font\"> 
        </td> 
         
  </tr> 
  </table> 
 <br>"; 

}
[/php]

@alver said:

e' in questa riga qui:*<select name="action" class="vform">"; *

<td align="left" class="$classb" bgcolor="$tablecolor" valign="middle">
<font size="1" color="$normalfontcolor" face="$font">
<form action="search.${phpExt}?".SID."" method="post" style="margin: 0">
<input type="text" name="q" value="$q" class="vform" size="25" onblur="if(this.value==""){alert('Inserisci almeno una parola');(this.value='Default';}"> Ricerca Per:
*<select name="action" class="vform">"; *
if($select == 'filename')
echo "

Niente c'e' qualche punto e virgola o slash di troppo!!
Penso!

Niente oggi è giornata, devo accoggermi degli " poco a poco.
Forse questa è la volta buona.

[php]
function show_search_form($select = 'filename') {
global $grants, $user_status, $font, $bordercolor, $headercolor, $classa,$classb,$backimg, $tablecolor, $mess, $phpExt, $q, $headerfontcolor;

echo " <table summary=\"\" border=\"0\" width=\"950\" bgcolor=\"$bordercolor\" cellpadding=\"4\" cellspacing=\"1\"> 
  <tr> 
    <th align=\"left\" class=\"$classa\" bgcolor=\"$headercolor\" valign=\"middle\"> 

<font size="2" face="$font" color="$headerfontcolor"><b>$mess[224]</b></font></font>
</th>
</tr>
<td align="left" class="$classb" bgcolor="$tablecolor" valign="middle">
<font size="1" color="$normalfontcolor" face="$font">
<form action="search.${phpExt}?".SID."" method="post" style="margin: 0">
<input type="text" name="q" value="$q" class="vform" size="25" onblur="if(this.value==""){alert('Inserisci almeno una parola');(this.value='Default';}"> Ricerca Per:
<select name="action" class="vform">";
if($select == 'filename')
echo "
<option value="showsearchresults_byfilename" selected>Cognome</option>
<option value="showsearchresults_byall">Per nome</option>";

     else 
        echo " 
        <option value=\"showsearchresults_byfilename\">Cognome</option> 
        <option value=\"showsearchresults_byall\" selected>Per nome</option>"; 
     echo " 
     </select> 
  <input class=\"vform\" type=\"submit\" value=\"Cerca\" > 
        </form><br> 
        <table summary=\"\" border=\"0\" width=\"90%\" bgcolor=\"$bordercolor\" cellpadding=\"4\" cellspacing=\"1\"> 
   
       
        <font size=\"1\" color=\"$normalfontcolor\" face=\"$font\"> 
        </td> 
         
  </tr> 
  </table> 
 <br>"; 

}
[/php]

Adesso non mi da piu l'errore ma non mi da l'allert!!