/*
function:   cTab-v1.0
author:     jin
depends:    jquery.js(1.2.6~1.4.0)
			
firstTime:  2009-8-13
lastTime:   2010-05-24
*/

//鍛藉悕绌洪棿
var UE_forum ={}
//browser
UE_forum.browser ={
//ie	
ie:!-[1,],
//ie6
ie6:!window.XMLHttpRequest		
}





UE_forum.toTop = function(){
	
	var leftWidth = (document.body.scrollWidth-980)/2 -25;
	
	var _top = $('<a href="#" class="btn_top" title="to top" style="left:' + leftWidth + 'px;  background:url(http://images.arabmmo.com/forum/templates/ar_new/images/top.gif) no-repeat; width:25px; height:51px; display:block; cursor:pointer; position:fixed; _position:absolute; bottom:150px; z-index:10; "></a> ');// 
	$('body').append(_top);
	
	function ie6Fixed(){
		var sh = document.body.scrollHeight,
			st = document.documentElement.scrollTop || window.pageYOffset || document.body.scrollTop ,
			ch = document.documentElement.clientHeight;
			
		if( sh > ( st + ch ) ) _top.css("top",st + ch - 150 + "px"); 
		if( sh == ( st + ch ) ) _top.css("top",sh - 150 + "px");
		
	}
	
	
	if(UE_forum.browser.ie6){
		ie6Fixed();
		window.attachEvent("onscroll",ie6Fixed);
	}
	
	function scrollHeight(){
		var $text  = document.getElementById("text"),
			st = document.documentElement.scrollTop || window.pageYOffset || document.body.scrollTop ,
			ch = document.documentElement.clientHeight;
			st >= ch ? _top.css("visibility","visible") : _top.css("visibility","hidden");

	}
	
	UE_forum.browser.ie ? window.attachEvent("onscroll",scrollHeight) : window.addEventListener('scroll', scrollHeight, true);
}