function validateEmail(email){
	if(email.value=="")
	{
		alert("Email-id cannot be empty");
		return false;
	}
	else
	{
		var emailValidation = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
		if(!email.value.match(emailValidation))
		{		
			alert("Please provide a valid email address!");
			return false;
		}
	}
	return true;
}

function validateUsername(uname){
	
	var username = uname.value;
	if(username == ""){
		alert("Username cannot be blank.");
		return false;
	}
	if((username.length) <= 3){
		alert("Username should be greater than 3 characters.");
		return false;
	}
	var temp;

	if(!(username.charAt(0)>="A" && username.charAt(0)<="z")){
		alert("Username should start with letter.");
		return false;
	}
	
	var patternString=/^([a-zA-Z0-9._]*$)/;
	if(!patternString.test(username)){
		alert("Username should be of (a to z) or (A to Z) letters, (0 to 9) numbers.");
		return false;
	} 
	
	/*if((username.charAt(username.length-1)>="A" && username.charAt(username.length-1)<="z") || (username.charAt(username.length-1)>="0" && username.charAt(username.length-1)<="9"))
	{
		temp="";
	}
	else{
		alert("Username should be of (a to z) or (A to Z) letters and (0 to 9) numbers.");
		return false;
	}
		
	for(var i=0;i<username.length;i++){
		temp=username.charAt(i);
		
		if((temp>="0" && temp<="9") || (temp>="A" && temp<="z") || (temp=="_") || (temp==".")){
			temp="";
			alert("ssss");
		}
		else
			return false;
	}*/
	return true;
}

function conformUsername(uname, re_uname){
	if(uname.value != re_uname.value){
		alert("New Username and Confirm Username should be same.");
		return false;
	}
	return true;
}