echo " <script language=\"javascript\" type=\"text/javascript\">
function tot(value)
{
    
     var totale = document.getElementById('total');
      var price = document.getElementById('price');
      var quantity = document.getElementById('quantity');

 
     total.value = price.value * quantity.value;  
}
   </script>

<form>
<input type=text id=\"price\"  name=\"price\" value=\"\" onchange=\"tot(this.value)\">
<input type=text id=\"quantity\"  name=\"quantity\" value=\"\" onchange=\"tot(this.value)\">
<input type=text id=\"total\"  name=\"total\" value=\"\" readonly>
<input type=\"button\" name=\"recalculate\" value=\"recalculate\" onclick=\"tot()\">
<input type=submit name=action value=Insert>
</form>
";