function checkemail(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Please enter a valid email address.");
		   return false;
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Please enter a valid email address.");
		   return false;
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Please enter a valid email address.");
		    return false;
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Please enter a valid email address.");
		    return false;
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Please enter a valid email address.");
		    return false;
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Please enter a valid email address.");
		    return false;
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Please enter a valid email address.");
		    return false;
		 }

 		 return true;
	}

function validate() {
	var emailaddress=document.contactform.contactemail

	if (document.contactform.contactname.value=="") {
		alert("Please enter your name.");
		document.contactform.contactname.focus();
		return false;
	}

	if (document.contactform.contactphone.value=="") {
		alert("Please enter your phone number.");
		document.contactform.contactphone.focus();
		return false;
	}

	if (document.contactform.contactemail.value=="") {
		alert("Please enter your email address.");
		document.contactform.contactemail.focus();
		return false;
	}

	if (checkemail(emailaddress.value)==false){
		emailaddress.value=""
		emailaddress.focus()
		return false;
	}

	document.contactform.submit();

}