//构造回传地址
function PostBackReadingIndexUrl(CurBtnType)
{
	var url="ScienceIndex.aspx?ColumnID="+CurBtnType;
	PostBack(url,"ReadingIndex");
}
//显示异步加载结果
function showResult(objID)
{
	if(xmlHttp.readyState==4 && xmlHttp.status==200)
	{
		var obj=document.getElementById(objID);
		obj.innerHTML=xmlHttp.responseText;
	}
}