function validateForm()
{	
    document.forms[0].hidAction.value="";
    document.forms[0].target = "_self";
    var products;
    products = get_radio_value();
    //alert(products); 
    
    if (products == 'businessprojectors') 
        return true;
    if (products == 'largeformat'){ 
        return true;
    }
    else
    {    
    return (
		checkInteger(document.SearchForm.elements["postcode"]) &&
		checkPostcode(document.SearchForm.elements["postcode"],"Postcode") 
	  )
    }
}

function checkPostcode(theField, s, emptyOK)
{   
    if (checkPostcode.arguments.length == 1) emptyOK = defaultEmptyOK;
    if ((emptyOK == true) && (isEmpty(theField.value))) return true;
    if ((emptyOK == true) && (isWhitespace(theField.value))) return true;  
    else
    {
       if ((theField.value.length != 3) && (theField.value.length != 4)                          )
			{ 
			return warnInvalid (theField,'Postcode no must contain 3 to 4 numeric characters');
			}
      else 
		  	{ 
         	return true;
			}
    }
}
function get_radio_value()
{
for (var i=0; i < document.SearchForm.products.length; i++)
   {
   if (document.SearchForm.products[i].checked)
      {
      return document.SearchForm.products[i].value;
      }
   }
}