function EMailCheck(s, err_msg){
 	var a = false;
 	var res = false;
 	
 	if(typeof(RegExp) == 'function'){
  		var b = new RegExp('abc');
  		
  		if(b.test('abc') == true){a = true;}
  	}

 	if(a == true){
  		reg = new RegExp('^([a-zA-Z0-9\\-\\.\\_]+)'+
                   '(\\@)([a-zA-Z0-9\\-\\.]+)'+
                   '(\\.)([a-zA-Z]{2,4})$');
  		res = (reg.test(s));
 	} else {
  		res = (s.search('@') >= 1 &&
        	   s.lastIndexOf('.') > s.search('@') &&
           	   s.lastIndexOf('.') >= s.length-5)
 	}
 
 	if (res==false) {
 		alert(err_msg);
 	}
 	
 	return(res);
}