function Left(obj, n)
{
  str = obj.value;
	if (n <= 0)
	    obj.value = '';
	else if (n > String(str).length)
	    obj.value = str;
	else
	    obj.value = String(str).substring(0,n);
}


function submitForm(nomeForm, azione)
{
  ObjFrm = eval('document.'+nomeForm);
  if ( arguments.length == 3 ) 
    ObjFrm.action = arguments[2];    
  
  ObjFrm.azione.value = azione;
  if ( ObjFrm.onsubmit() ) ObjFrm.submit();
  //ObjFrm.onSubmit() ? ObjFrm.submit() : return false;
}

function IsNumeric(sText)
{
   var ValidChars = "0123456789.";
   var comma = ".";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
   { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
      {
        IsNumber = false;
      }
   }
   return IsNumber;
   
}