function ltrim(str) {
 chars =   "\\s";
  return str.replace(new RegExp("^[" + chars + "]+", "g"), "");
}
 
function rtrim(str) {
 chars =   "\\s";
 return str.replace(new RegExp("[" + chars + "]+$", "g"), "");
}
 
function isValidEmail(emailid)
{
	var emailRegEx = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if(emailid!="" && emailid.match(emailRegEx))
		return true;
	else
		return false;
}