// JavaScript Document

 
$(function(){
	 Function.prototype.added = function(name,funct)
	 {
	 	this.prototype[name] = funct;
	 	return this;
	 }
	 function all_class()
	 {
	 
	 }
 	all_class.added('hd',function(obj,obj2){
		 obj.hover(function(){
		 
		 	$(this).addClass("active").
			find("em").addClass("uplogin");
		 	$(this).find(".t_m_login").show()
		 			 
									},function(){
									 
									$(this).removeClass("active").
									find("em").removeClass("uplogin"); 
									$(this).find(".t_m_login").hide()
													}
					);//end obj.hover		
	
	
			//文本框的点击
			var yz = "";
			var xz = "";
			
			obj2.each(function(event){
			 $(this).click(function(event){
			    yz = $(this).val();
			 	$(this).val("").
				css("color","#333");
			 
			 }).blur(function(event){
			 	xz = $(this).val();
				
				 if($.trim(xz)=="")
				 {
				 	$(this).val(yz).css("color","#9a9a9a");
				 }
				 else
				 {
				 	if(yz==xz)
					{
						$(this).val(yz).css("color","#9a9a9a");
					}
				 }
			 
			 });
			
			
			}); 
	});
	
	var sl = new all_class();
	sl.hd($("#hd"),$(".t_m_login input[type='text']"));

});