Watermark jquery

/*
 * Copyright (c) 2007 Josh Bush (digitalbush.com)

 //Example: jQuery Document Ready -- pass a function to $()
 jQuery(function($){
   $("#first").Watermark("First");
   $("#mi").Watermark("MI");
   $("#last").Watermark("Last");
   $("#suffix").Watermark("Suffix");
});

//Optionally, if you are not satisfied with the default gray watermark color, you may pass a second argument to the watermark function.
jQuery(function($){
   $("#suffix").Watermark("Suffix","#369");
});

//Finally, once you are ready to pull data from your watermarked input boxes, you can clear all of the watermarks and then replace them after you are finished.
function UseData(){
   $.Watermark.HideAll();
   //Do Stuff
   $.Watermark.ShowAll();
}

*/

(function($) {
    var map=new Array();
    $.Watermark = {
        ShowAll:function(){
            for (var i=0;i<map.length;i++){
                if(map[i].obj.val()==""){
                    map[i].obj.val(map[i].text);
                    map[i].obj.css("color",map[i].WatermarkColor);
                }else{
                    map[i].obj.css("color",map[i].DefaultColor);
                }
            }
        },
        HideAll:function(){
            for (var i=0;i<map.length;i++){
                if(map[i].obj.val()==map[i].text)
                    map[i].obj.val("");
            }
        }
    }

    $.fn.Watermark = function(text,color) {
        if(!color)
            color="#aaa";
        return this.each(
            function(){
                var input=$(this);
                var defaultColor=input.css("color");
                map[map.length]={text:text,obj:input,DefaultColor:defaultColor,WatermarkColor:color};
                function clearMessage(){
                    if(input.val()==text)
                        input.val("");
                    input.css("color",defaultColor);
                }

                function insertMessage(){
                    if(input.val().length==0 || input.val()==text){
                        input.val(text);
                        input.css("color",color);
                    }else
                        input.css("color",defaultColor);
                }

                input.focus(clearMessage);
                input.blur(insertMessage);
                input.change(insertMessage);

                insertMessage();
            }
        );
    };
})(jQuery);