jQuery.extend({dimScreen:function(speed,opacity,callback){if(jQuery('#__dimScreen').size()>0)return;if(typeof speed=='function'){callback=speed;speed=null;}
if(typeof opacity=='function'){callback=opacity;opacity=null;}
if(speed<1){var placeholder=opacity;opacity=speed;speed=placeholder;}
if(opacity>=1){var placeholder=speed;speed=opacity;opacity=placeholder;}
speed=(speed>0)?speed:500;opacity=(opacity>0)?opacity:0.5;return jQuery('<div></div>').attr({id:'__dimScreen',fade_opacity:opacity,speed:speed}).css({background:'#000',height:$(document).height()+'px',left:'0px',opacity:0,position:'absolute',top:'0px',width:$(document).width()+'px',zIndex:999}).appendTo(document.body).fadeTo(speed,0.7,callback);},dimScreenStop:function(callback){var x=jQuery('#__dimScreen');var opacity=x.attr('fade_opacity');var speed=x.attr('speed');x.fadeOut(speed,function(){x.remove();if(typeof callback=='function')callback();});}});