function echeck(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 e-mail address!!!");
		return false;
	}

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

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

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

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

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

	return true;					

}

function checkForm(){

	var name = document.getElementById("name").value;
  	var email = document.getElementById("email").value;
  	
  	if ((name == null)||(name == "")){
		alert("Please enter your name!!!");
		document.getElementById("name").focus();
		return false;
	}
	
	if ((email == null)||(email == "")){
		alert("Please enter your e-mail address!!!");
		document.getElementById("email").focus();
		return false;
	}
	
	if (echeck(email) == false){
		document.getElementById("email").value = "";
		document.getElementById("email").focus();
		return false;
	}
	
	return true;
	
}