(function(){
	var _SINA_WOOCALL_WELCOME_IMG = 'http://i1.sinaimg.cn/woocall/images/woocall_bj2008_bg.jpg';
	(new Image()).src = _SINA_WOOCALL_WELCOME_IMG;
	
	var $ = function(id){
		return document.getElementById(id) || null;
	}
	
	function changeWelcome(){
		var div = $('S_WC_FLA_BOX');
		
		var a = div.getElementsByTagName('a')[0];
		var w = div.clientWidth || div.offsetWidth || div.scrollWidth;
		var h = div.clientHeight || div.offsetHeight || div.scrollHeight;
		a.style.width = w + 'px';
		a.style.height = h + 'px';
		a.parentNode.style.background = '#7db4f4 url(' + _SINA_WOOCALL_WELCOME_IMG + ') no-repeat center center';
		a.style.top = '0px';
		while (a.firstChild){
			a.removeChild(a.firstChild);
		}	
		/*
		var oImg = document.createElement('img');
		oImg.style.cssText = 'border:none; margin:0px; padding:0px;';
		oImg.setAttribute('src', 'http://i2.sinaimg.cn/woocall/images/woocall_bj2008_bg.jpg');
		a.appendChild(oImg);
		*/
	}
	
	function startChange(){
		setTimeout(function(){
			try{
				changeWelcome();		
			}catch(e){
				startChange();	
			}					 
		},_SINA_WOOCALL_START_BG_TO *= 1.5);
	}
	var _SINA_WOOCALL_START_BG_TO = 100;
	startChange();
	
})();