function checkForm(obj, elems) {
	var element, pattern;
	var reg = new RegExp("[0-9a-z_]+@[0-9a-z_^.]+\\.[a-z]{2,3}", 'i');
	for (var i = 0; i < obj.elements.length; i++) {
		element = obj.elements[i];
		if (elems != undefined)
		if (elems.join().indexOf(element.type) < 0) continue;
		if (element.value == 'марка и модель' || element.value == 'куб.см' || element.value == 'л.с.') {
			alert(element.getAttribute("required"));
			element.focus();
			return false;
		}
		if (!element.getAttribute("required")) continue;
		if (pattern = element.getAttribute("check_pattern")) {
			pattern = new RegExp(pattern, "g");
			if (!pattern.test(element.value)) {
				alert(element.getAttribute("required"));
				element.focus();
				return false;
			}   
		}
		else if(/^\s*$/.test(element.value)) {
			alert(element.getAttribute("required"));
			element.focus();
			return false;
		}
		if (null!=element.getAttribute("mail"))
		if (!reg.test(element.value)) {
			alert(element.getAttribute("mail"));
			element.focus(); 
			return false;
		}
    }
	return true;
}