var defaultWitdh;
function setShift(sender){
try{
	bgshift.style.width = sender.offsetLeft;
	var tSrc = String(sender.firstChild.src);
	if(tSrc){
		var re = /(.*\/)([^\/\.]*)(\.[^\/\.]*)$/gi
		var expRet = re.exec(tSrc);
		var path = expRet[1];
		var name = expRet[2];
		var ext = expRet[3];
		sender.firstChild.src = path +name+"a"+ext;
	}
}catch(e){}
}
function removeShift(sender){
try{
	bgshift.style.width = defaultWitdh;
	var tSrc = String(sender.firstChild.src);
	if(tSrc){
		var re = /(.*\/)([^\/\.]*)a(\.[^\/\.]*)$/gi
		var expRet = re.exec(tSrc);
		var path = expRet[1];
		var name = expRet[2];
		var ext = expRet[3];
		sender.firstChild.src = path +name+ext;
	}
}catch(e){}
}
function setstartShift(id){
	document.shiftId = id;
	document.onreadystatechange = finishInit;
}
function finishInit(){
	if (document.readyState=="complete"){
		defaultWitdh = document.all(document.shiftId).offsetLeft;
		bgshift.style.width = defaultWitdh;
	}
}