//标题栏切换隐藏
	function getElement ( ElementID ) {
		return document.getElementById(ElementID);
	}
	//点击变换
	function switchElement ( ElementID , className ) {
		getElement(ElementID)[className] = getElement(ElementID)[className] == "open" ? "close" : "open";
	}
	//层的显示和隐藏
	function changeDiv ( ElementID ) {
		getElement(ElementID).style.display = getElement(ElementID).style.display == "none" ? "" : "none";
	}
	//Class变换
	function changeClass ( ElementID , className ) {
		getElement(ElementID)["className"] = className;
	}
	
	//第二组
	function switchElement2 ( ElementID , className ) {
		getElement(ElementID)[className] = getElement(ElementID)[className] == "openb" ? "closeb" : "openb";
	}
//变换字体大小
function doZoom(size){document.getElementById('b_contant').style.fontSize=size+'px';}

//文章打印功能
function doPrint(){
if(window.print !=null){
window.print();
}else{alert('请选择打印机.');}
}