Passar um valor gerado por JS para PHP

[MarcoMonteiro]

sim, mas isto não foi programado por mim, peguei agora no projecto e eu não tenho muita experiência com JS... vou postar o código e assim ja me podem ajudar a colocar o resultado num form..


codigo JS

Código PHP:

<script type="text/JavaScript">
<!--
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

function on_focus(id)
{
 if(document.getElementById(id).value == 'Enter the height of your wall' || document.getElementById(id).value == 'Enter the width of your wall'){document.getElementById(id).value = '';}
}

function on_change()
{
 if(document.getElementById('haut').value == 'Enter the height of your wall'){
 Haut = '1';}
 else{
 Haut = document.getElementById('haut').value; 
 Hautinch = eval(document.getElementById('haut').value/2.54);
 document.getElementById('inch1').value = Hautinch.toFixed(2);
 
 }
 if(document.getElementById('larg').value == 'Enter the width of your wall'){Larg = '1';}
 else{
 Larg = document.getElementById('larg').value;
 Larginch  = eval(document.getElementById('larg').value/2.54);
 document.getElementById('inch2').value = Larginch.toFixed(2);
 
 }
 Tot = eval((Haut/100)*(Larg/100));
 document.getElementById('prix').innerHTML = eval(Math.ceil(Tot)*<?php echo $preco; ?>);
 document.getElementById('model').value = Haut+'X'+Larg;
}
//-->
</script> 


codigo php

Código PHP:

<form action="cart.php?id=<?php echo $idproduto; ?>&&preco=<?php echo $preco; ?>" method="post" name="p">
<td width="251" height="135" valign="top"><br>
           </td>
        <td class="grasrouge" width="20" valign="top">&nbsp;</td>
        <td class="grasrouge" width="377" valign="top"><br>
          <input name="taille" id="taille" value="S" type="hidden">

          <input name="add" id="add" value="ok" type="hidden">
          <input name="model" id="model" value="" type="hidden">
          <input name="id" id="id" value="5099" type="hidden">
          <table width="369" border="0" cellpadding="0" cellspacing="0">
          <tbody><tr>
            <td width="91" height="25">HEIGHT :</td>
            <td width="142" height="25"><label>
              <input name="haut" class="paragraphe" id="haut" value="Enter the height of your wall" onFocus="on_focus('haut')" onKeyUp="on_change()" size="12" maxlength="30" type="text">

            cm</label></td>
            <td width="136"><label>
              <input name="inch1" class="paragraphe" id="inch1" size="12" maxlength="15" onKeyUp="on_change2()" type="hidden">
              <span class="paragraphe">inch</span></label></td>
          </tr>
          <tr>
            <td height="25">WIDTH :</td>

            <td height="25"><input name="larg" class="paragraphe" id="larg" value="Enter the width of your wall" onFocus="on_focus('larg')" onKeyUp="on_change()" size="12" maxlength="30" type="text">
              cm</td>
            <td height="25"><label>
              <input name="inch2" class="paragraphe" id="inch2" size="12" maxlength="10" onKeyUp="on_change2()" type="hidden">
              <span class="paragraphe">inch</span></label></td>
          </tr>
          <tr>
            <td height="25">PRICE : </td>
            <td colspan="2" class="grasrouge" height="25"><p id="prix" style="display: inline;">0</p> euros</td>
          </tr>
          <tr>
            <td height="30">&nbsp;</td>
            <td><input name="submit" type="submit"></td>
          </tr>
        </tbody></table>
        </td>
      </form> 


Todos os campos estão num campo de formulário, excepto o resultado, e esse é que eu queria, que posso fazer para mudar isso?