function checkemail(sEmailAddress){

	var flag;
	var pattern = /^([a-zA-Z0-9])+([\.a-zA-Z0-9_-])*@([a-zA-Z0-9_-])+(\.[a-zA-Z0-9_-]+)+/;
	var flag = pattern.test(sEmailAddress);
	
	if(!flag)
	{return false;}
 	else{return true;}
}