/////ПРОВЕРКА ВВЕДЕННЫХ ДАННЫХ////
function check()
{
//alert(year); 
if (document.getElementById('firstname').value!="") {document.getElementById('firstname').style.background="#FFFFFF";}
if (document.getElementById('lastname').value!="") {document.getElementById('lastname').style.background="#FFFFFF";}
if (document.getElementById('email2').value!="") {document.getElementById('email2').style.background="#FFFFFF";}
if (document.getElementById('subject').value!="") {document.getElementById('subject').style.background="#FFFFFF";}
if (document.getElementById('message').value!="") {document.getElementById('message').style.background="#FFFFFF";}

var err=0,err1=0,err2=0;
if (document.getElementById('firstname').value=="") {document.getElementById('firstname').style.background="#FFDFDF"; err=1;}
if (document.getElementById('lastname').value=="") {document.getElementById('lastname').style.background="#FFDFDF"; err=1;}
if (document.getElementById('email').value=="") {document.getElementById('email').style.background="#FFDFDF"; err=1;}
if (document.getElementById('subject').value=="") {document.getElementById('subject').style.background="#FFDFDF"; err=1;}
if (document.getElementById('message').value=="") {document.getElementById('message').style.background="#FFDFDF"; err=1;}

//if (d1>d2) alert("d1>d2"); else alert("d2>d1");
if ((err==1)||(err1==1)||(err2==1)){alert("The required fields are empty!");return false;} else return true;
}