function f1(){
	var ar = document.getElementById("ar1");
    var cl = document.getElementById("click");
    ar.src = 'img/a1-h.gif';
    cl.src = 'img/click-h.gif';
}
function f2(){
	var ar = document.getElementById("ar1");
    var cl = document.getElementById("click");
    ar.src = 'img/a1.gif';
    cl.src = 'img/click.gif';
}
function f3(){
	var ar = document.getElementById("ar2");
	var se = document.getElementById("send");
    ar.src = 'img/a1-h.gif';
    se.src = 'img/send-h.gif';
}
function f4(){
	var ar = document.getElementById("ar2");
	var se = document.getElementById("send");
    ar.src = 'img/a1.gif';
    se.src = 'img/send.gif';
}
function isEmail(e){
	var p = /^[-._&0-9a-zA-Z]+[@][-._&0-9a-zA-Z]+[.][._0-9a-zA-Z]+[a-zA-Z]$/;
   if (!p.test(e)){
         return false;
   }
   return true;
}
function Verify(frm){
	var n = frm._yourname.value;
	var e = frm._hisemail.value;
	if(n.length < 1){
		alert("Please write your name");
		return false;
	}
	if(!isEmail(e)){
		alert("Please write your friend's email");
		return false;
	}
	return true;
}