function validateform(){
	var yourname;
	yourname = document.getElementById('yourname');
	
	var youremail;
	youremail = document.getElementById('youremail');

	var yourphone;
	yourphone = document.getElementById('yourphone');

	if(youremail.value == "")
		{
		alert("Please enter your email address");
		youremail.focus();
		return false;
		}
	if(emailcheck(youremail.value) == false){
		alert("E-mail address is invalid");
		youremail.focus();
		return false;
		}
	if(yourname.value == "")
		{
		alert("Please enter your name");
		yourname.focus();
		return false;
		}
	if(yourphone.value == "")
		{
		alert("Please enter your phone number");
		yourphone.focus();
		return false;
		}
	return true;
}
function emailcheck(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    return false
		 }

 		 return true					
	}