if (document.all) var IE4=true;
else if (document.layers) var NN4=true;
else var OTHER=true;

var inMenu1 = false;

if (document.images){
    var nav1on = new Image(); nav1on.src = "/images/top_h01.jpg"
	var nav1off = new Image(); nav1off.src = "/images/top_01.jpg"
	var nav2on = new Image(); nav2on.src = "/images/top_h02.jpg"
	var nav2off = new Image(); nav2off.src = "/images/top_02.jpg"
	var nav3on = new Image(); nav3on.src = "/images/top_h03.jpg"
	var nav3off = new Image(); nav3off.src = "/images/top_03.jpg"
	var nav4on = new Image(); nav4on.src = "/images/top_h04.jpg"
	var nav4off = new Image(); nav4off.src = "/images/top_04.jpg"
	var nav5on = new Image(); nav5on.src = "/images/top_h05.jpg"
	var nav5off = new Image(); nav5off.src = "/images/top_05.jpg"
	var nav6on = new Image(); nav6on.src = "/images/top_h06.jpg"
	var nav6off = new Image(); nav6off.src = "/images/top_06.jpg"
}

function act(imgName){
	if (document.images){
		document[imgName].src = eval(imgName + "on.src")
	}
}

function inact(imgName){
	if (document.images){
		document[imgName].src = eval(imgName + "off.src")
	}
}

function show(who){
	if (document.layers) {
		who.visibility = 'show';
	}else if (document.all) {
		who.visibility = 'visible';
	}
}

function hide(who){
	if (document.layers) {
		who.visibility = 'hide';
	}else if (document.all) {
		who.visibility = 'hidden';
	}
}

function init() {
//	if (document.layers) {
//		menu1 = window.document.menuList;
//	}else if (document.all) {
//		menu1 = menuList.style;
//	}
}

function checkMenuVisibility(){
	if (inMenu1 == true) {
		show(menu1);
	} else {
		hide(menu1);
	}
	setTimeout("checkMenuVisibility()", 100);
}

function ImageOn(layerID, imgName) {
  if (IE4) { 
		imgOn = eval(imgName + "on.src"); 
		if (document.images[imgName]) document.images[imgName].src = imgOn;
	}
  if (NN4) { 
		imgOn = eval(imgName + "on.src");
		if (document.layers[layerID].document.images[imgName])
    	document.layers[layerID].document.images[imgName].src = imgOn;
	}
}

function ImageOff(layerID, imgName) {
  if (IE4) { 
		imgOff = eval(imgName + "off.src"); 
		if (document.images[imgName]) document.images[imgName].src = imgOff; 
	}
  if (NN4) { 
		imgOff = eval(imgName + "off.src");
		if (document.layers[layerID].document.images[imgName])
	    document.layers[layerID].document.images[imgName].src = imgOff; 
	}
}/*<a href="http://xmcyberpolice.cn/alert.asp" target=_blank><img src="http://xmcyberpolice.cn/image/gt.gif" width  ="30" border='0'></a>*/