// JavaScript Document
function getObject(objectId) {
    if(document.getElementById && document.getElementById(objectId)) {
	// W3C DOM
	return document.getElementById(objectId);
    } else if (document.all && document.all(objectId)) {
	// MSIE 4 DOM
	return document.all(objectId);
    } else if (document.layers && document.layers[objectId]) {
	// NN 4 DOM.. note: this won't find nested layers
	return document.layers[objectId];
    } else {
	return false;
    }
}
function overWeb(n){
	for (i = 1; i<4; i++) {
		if(n==i){
			getObject("m" + n).style.background= "url(images/case_l_1.gif) no-repeat bottom";
			getObject("m" + n).className="bold1";
			getObject("mc" + n).style.display= "block"
		}	
		else {
			getObject("m" + i).style.background= "url(images/case_l_1.gif)";
			getObject("m" + i).className="bold2";
			getObject("mc" + i).style.display= "none"
		}
	}
	
}

function overyu(n){
	for (i = 1; i<4; i++) {
		if(n==i){
			getObject("yu" + n).style.background= "url(images/case_bg_1.jpg) no-repeat bottom";
			getObject("yu" + n).className="bold1";
			getObject("yuc" + n).style.display= "block"
		}	
		else {
			getObject("yu" + i).style.background= "url(images/case_bg_1.jpg)";
			getObject("yu" + i).className="bold2";
			getObject("yuc" + i).style.display= "none"
		}
	}
	
}


<!--域名注册页面-->
function overmm(n){
	for (i = 1; i<3; i++) {
		if(n==i){
			getObject("mm" + n).className="mm_nav1";
			getObject("mmc" + n).style.display= "block"
		}	
		else {
			getObject("mm" + i).className="mm_nav2";
			getObject("mmc" + i).style.display= "none"
		}
	}
	
}

function overch(n){
	for (i = 1; i<3; i++) {
		if(n==i){
			getObject("ch" + n).className="mm_nav1";
			getObject("chc" + n).style.display= "block"
		}	
		else {
			getObject("ch" + i).className="mm_nav2";
			getObject("chc" + i).style.display= "none"
		}
	}
	
}
<!--内面底部“我们的优势”-->

function overb(n){
	for (i = 1; i<5; i++) {
		if(n==i){
			getObject("b" + n).style.background= "url(../images/case_l_01.gif) no-repeat bottom";
			getObject("b" + n).className="bold1";
			getObject("bc" + n).style.display= "block"
		}	
		else {
			getObject("b" + i).style.background= "url(../images/case_l_01.gif)";
			getObject("b" + i).className="bold2";
			getObject("bc" + i).style.display= "none"
		}
	}
	
}

function overa(n){
	for (i = 1; i<7; i++) {
		if(n==i){
			getObject("a" + n).style.background= "url(../images/case_l_01.gif) no-repeat bottom";
			getObject("a" + n).className="bold1";
			getObject("ac" + n).style.display= "block"
		}	
		else {
			getObject("a" + i).style.background= "url(../images/case_l_01.gif)";
			getObject("a" + i).className="bold2";
			getObject("ac" + i).style.display= "none"
		}
	}
	
}