$.fn.clearOnFocus = function() {
        return this.focus(function() {
            var v = $(this).val();
			var f = "";
			var run = false;
            if (v === this.defaultValue){
			run = true;
			} else {
			f = v;
			}
			$(this).val(f);
        }).blur(function() {
            var v = $(this).val();
            var f = "";
            var run = false;
            if (v.match(/^\s+$|^$/)) {
                f = this.defaultValue;
                run = true;
            } else { f = v; run = false; }
            $(this).val(f);
        });

    };