http://moscons.ru/bitrix/templates/mfc/js/send.js

1function isValidEmail (email, strict)
2{
3	if ( !strict ) email = email.replace(/^\s+|\s+$/g, '');
4	return (/^([a-z0-9_\-]+\.)*[a-z0-9_\-]+@([a-z0-9][a-z0-9\-]*[a-z0-9]\.)+[a-z]{2,4}$/i).test(email);
5}
6							function checkField(el,num,txt,checkmail)
7							{
8								var checked = true;
9								var inp = $('.sendForm '+el+':eq('+num+')');
10								if (checkmail)
11								{
12									if (!isValidEmail(inp.val()) || inp.val()==txt) condition = true; else condition = false;
13								} else
14									{
15										if (inp.val()=='' || inp.val()==txt) condition = true; else condition = false;
16									}
17								if (condition)
18								{
19									inp.val(txt);
20									inp.css("color","#c90000");								
21									inp.bind("focus",function() {
22										if ($(this).val()==txt) 
23										{
24											$(this).val('');
25											$(this).css("color","#222222");
26											$(this).unbind();
27										}
28									});
29									checked = false;
30								}
31								return checked;								
32							}
33
34$(document).ready(function() {
35	$('#buttonSend').bind("mousedown",function() {$(this).css("top","1px");});
36	$('#buttonSend').bind("mouseup",function() {$(this).css("top","0");});
37	$('#buttonSend').bind("click",function () {
38		var sm = true;
39		sm = checkField('input',0,'Укажите ваше имя',false);
40		sm = checkField('input',1,'Укажите корректный e-mail',true);
41		sm = checkField('textarea',0,'Напишите сообщение',false);
42		if (sm) {return true;} else {return false;}		
43	});
44});