NS4 = (document.layers) ? 1 : 0;
IE4 = (document.all) ? 1 : 0;
ver4 = (NS4 || IE4) ? 1 : 0;

if (ver4) {
    with (document) {
        write("<STYLE TYPE='text/css'>");
        if (NS4) {
            write(".parent {position:absolute; visibility:visible}");
            write(".child {position:absolute; visibility:visible}");
            write(".regular {position:absolute; visibility:visible}")
        }
        else {
            write(".child {display:none}")
        }
        write("</STYLE>");
    }
}


function arrange() {
    nextY = document.layers[firstInd].pageY +document.layers[firstInd].document.height;
    for (i=firstInd+1; i<document.layers.length; i++) {
        whichEl = document.layers[i];
        if (whichEl.visibility != "hide") {
            whichEl.pageY = nextY;
            nextY += whichEl.document.height;
        }
    }
}

function initIt(){
    if (!ver4) return;
    if (NS4) {
        for (i=0; i<document.layers.length; i++) {
            whichEl = document.layers[i];
            if (whichEl.id.indexOf("Child") != -1) whichEl.visibility = "hide";
       }
        arrange();
    }
    else {
        divColl = document.all.tags("DIV");
        for (i=0; i<divColl.length; i++) {
            whichEl = divColl(i);
            if (whichEl.className == "child") whichEl.style.display = "none";
        }
    }
}

function expandIt(el) {
    if (!ver4) return;
    if (IE4) {
	    divColl = document.all.tags("DIV");//把网页中<div>装入变量divColl中
  
	    for (i=0; i<divColl.length; i++)//取得网页中<div>个数
		{
			whichEl = divColl(i);
			if (whichEl.className == "child") //判断div的名称为child
	        {            
	        	whichEl=eval(whichEl.id);        //取得div为child的id名
				if (whichEl.style.display == "none") //判断是否显示状态
 				{
	            	//   whichEl.style.display = "block";		   
				}
		        else {    
					var sos;
					sos=whichEl.id;
    	            whichEl.style.display = "none"; //如果显示则设为不显示
 				}
	        }
		}   
    
		whichEl = eval(el);//获得激活显示的div的id名
		if (sos!=whichEl.id)
		{
			//         if (whichEl.style.display   

	        if (whichEl.style.display == "none") {//判断是否显示状态
    	       whichEl.style.display = "block";	//如果没有显示则设为显示	   
	        }
	        else {
    	        whichEl.style.display = "none";	//如果显示则设为不显示
 			 }
		}
    }
}
//onload = initIt;