function validate_shopcart_form() {
	theForm = document.getElementById('modform');
	
	for (i = 0; i < theForm.elements.length; i++) {		
		if (theForm.elements[i].id.substring(0,3) == "qty") {			
			if (isNaN(theForm.elements[i].value)) {
				alert("Quantity must be numeric");
				theForm.elements[i].focus();
				return false;
			}	
		}
	}

	return true;
}

addLoadEvent(function() {
	if (document.getElementById('modform')) {
		document.getElementById('modform').onsubmit = function() {
			return validate_shopcart_form();
		}
	}
	
	if (document.getElementById('delivery_f')) {
		document.getElementById('delivery_f').onclick = function() {
			document.getElementById('modform').submit();
		}
	}
	
	if (document.getElementById('delivery_x')) {
		document.getElementById('delivery_x').onclick = function() {
			document.getElementById('modform').submit();
		}
	}
	
	if (document.getElementById('country')) {
		document.getElementById('country').onchange = function() {
			document.getElementById('modform').submit();
		}
	}
	
	// PREORDER POPUP
	if (document.getElementById('preorderlink')) {
		document.getElementById('preorderlink').onclick = function() {
			prewin = window.open("/preform.php?p=1","prewin","width=450,height=450,resizable=no,scrollbars=no,toolbar=no,location=no,menubar=no");
			
			return false;
		}
	}
});