// <![CDATA[
	function enabled_submit()
	{
		if (document.forms['feedback'].first_name.value!='' &
			document.forms['feedback'].last_name.value!='' &
			document.forms['feedback'].patronymic.value!='' &
			document.forms['feedback'].email.value!='' &
			document.forms['feedback'].tnumber_code.value!='' &
			document.forms['feedback'].tnumber.value!='' &
			document.forms['feedback'].adress.value!='') 
			{document.forms['feedback'].submit_button.disabled=false;}
		else {document.forms['feedback'].submit_button.disabled=true;}
	
	function checkmail() {
   		var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
		var address = document.forms['feedback'].email.value;
		if(reg.test(address) == false)
		{
      		alert("Пожалуйста, введите свой настоящий e-mail!");
			document.forms['feedback'].submit_button.disabled=false;
		}
		else document.forms['feedback'].submit_button.disabled=true;
	}
// ]]>