function validateEmpty() {
	var Product_Literature_Requested = getElement('Product_Literature_Requested');
	var Product_Type_Requested = getElement('Product_Type_Requested');
    var error = "";
  	//Product_Literature_Requested
    if (Product_Literature_Requested.checked == true && Product_Type_Requested.value == "Select Products") {
        Product_Type_Requested.style.background = 'Yellow'; 
        alert("If Send Product Literature is selected\n\ryou must select the literature to be sent.");
		return false;
    } 
}

function getElement (id) {
	if (document.getElementById) {
	return document.getElementById(id);
	}
	
	else if (document.all) {
	return window.document.all[id];
	}
	
	else if (document.layers) {
	return window.document.layers[id];
	}
}