function emailCheck (emailStr) 
{
	var emailPat=/^(.+)@(.+)\.(.+)$/;
	var matchArray=emailStr.match(emailPat);

	if (matchArray==null) 
	{
		return false;
	}
	return true;
}

function checkFormCB(sender)
{

	var access=true;

	document.getElementById("er1").style.display="none";
	document.getElementById("er2").style.display="none";
	document.getElementById("er3").style.display="none"; 
	document.getElementById("er4").style.display="none";
	document.getElementById("er5").style.display="none"; 

	if(sender.name.value==""){ document.getElementById("er1").style.display="block"; access=false;}
	if(sender.phone.value==""){ document.getElementById("er2").style.display="block"; access=false;}
	if(sender.adr.value==""){ document.getElementById("er3").style.display="block"; access=false;}
	if(sender.email.value==""){ document.getElementById("er4").style.display="block"; access=false;}
	else if(!emailCheck(sender.email.value)){ document.getElementById("er5").style.display="block"; access=false;} 
	
	if(access) return true;
	else	return false;
		
}

function isInt(event){
	access=1;
    if(event.keyCode==0){ access=0; keyCode=event.charCode; }
    else    keyCode=event.keyCode;

	//alert(keyCode);
    if((keyCode < 48 || keyCode > 57) && keyCode!=45){
    	//aler("Недопустимый символ");
    	if(access==0)   event.preventDefault();
        else    event.returnValue=false;
    }
}