//一个效的子菜单ID，用于关闭所有子菜单的显示
var layerLeftMax=leftLayer.length+5;
//字菜单名称,xxxn
var layerLeftName="subleftmenu";
var layerLeftNamea="subleftmenua";
//顶级菜单项名称
var menuLeftItem="menuLeftItem";




//--------------- 生成主菜单 ------------//
function createLeftMenu()
{ 
	document.write("<table cellspacing=0 cellpadding=0><tr><td><div id='leftmenu' style='position:relative; left:0px; top:0px; width:100%;' ><table width='250' border='0' align='left' cellpadding='0' cellspacing='0'>");
	document.write("<tr><td height='18' align='left' class='padding-secondmenu2' onmouseover=showLeftmenuLeftItem("+layerLeftMax+")>&nbsp;</td></tr>");
	for(var i=0;i<leftLayer.length;i++)
	{
		var leftLayerList=eval("subLeftLayer"+i);
		if (leftLayerList.length<1 || leftLayerList[0]=="")
		{
			document.write("<tr><td id='"+menuLeftItem+i+"' height='16' align='left' class='padding-secondmenu-disabled'>"+leftLayer[i]+"</td></tr>");
		}
		else
		{
			document.write("<tr><td id='"+menuLeftItem+i+"' height='16' align='left' onmouseover=showLeftmenuLeftItem("+i+") class='padding-secondmenu'>"+leftLayer[i]+"</td></tr>");
		}
	}
	document.write("<tr><td  height='16' align='left' class='padding-secondmenu2' onmouseover=showLeftmenuLeftItem("+layerLeftMax+")>&nbsp;</td></tr>");
	document.write("</table>");

	for(var j=0;j<leftLayer.length;j++)
	{
		createLeftmenuLeftItem(j);
	}
	document.write("</div></td></tr></table>");
}


//--------------- 生成次下拉菜单 ------------//
function createLeftmenuLeftItem(num)
{
	var leftLayerList=eval("subLeftLayer"+num);
	var leftLayerHttpList=eval("subLeftLayerHttp"+num);
	var leftLayerHttpStyleList=eval("subLeftLayerHttpStyle"+num);
	//阴影层
	if (num==0)
	{
		document.write("<div id='shadeLayer' style='position:absolute; left:190px; top:2px; visibility: hidden'>");
		document.write("<table width='522' height='297' border='0' cellpadding='0' cellspacing='0'>");
    	document.write("<tr><td>");
		document.write("<img src='images/studypopo1.gif' style='filter:progid:DXImageTransform.Microsoft.Blur(makeShadow=true,pixelRadius=3,shadowOpacity=0.5);'>");
		document.write("&nbsp;</td></tr></table></div>");
	}
	
	//显示内容
	document.write("<div id='"+layerLeftName+num+"' style='position:absolute; left:190px; top:2px; visibility: hidden;' onmouseover=showLeftmenuLeftItem("+num+") onmouseout=showLeftmenuLeftItem("+layerLeftMax+")>");
	document.write("<table width='520' height='297' border='0' cellpadding='0' cellspacing='0'>");
	document.write("<tr><td background='"+leftLayerBgPic[num]+"' valign='middle'  style='background-repeat: no-repeat;' align='left'>");
	
	//滚动条的表格
	document.write("<table width='520' height='297'  border='0' cellpadding='0' cellspacing='0'>");
	document.write("<tr><td valign='bottom' align='right' width='37'>");
	//滚动条 
	if (leftLayerList.length>14)
	{
		document.write("<table width='20' border='0' cellspacing='0' cellpadding='0'>");
		document.write("<tr><td height='10' onMouseOver='scrollObj(menuContent"+num+",-1)' onMouseOut='scrollObj(menuContent"+num+",0)' onMouseDown='scrollObj(menuContent"+num+",-8)' style='cursor:hand;'><img src='images/ups.gif'></td></tr>");
		document.write("<tr><td height='10' onMouseOver='scrollObj(menuContent"+num+",1)' onMouseOut='scrollObj(menuContent"+num+",0)' onMouseDown='scrollObj(menuContent"+num+",8)' style='cursor:hand;'><img src='images/downs.gif'></td></tr>");
		document.write("</table>");
	}
	else
	{
		document.write("&nbsp;");
	}
	document.write("</td>");
	document.write("<td width='499'   id='SubLeftItemPic"+num+"'  style='background-repeat: no-repeat;background-position: right;'>");
	//具体的内容-----
	document.write("<div style='OVERFLOW-X:hidden;OVERFLOW-Y:hidden;height:275px;overflow:hidden;' id='menuContent"+num+"'>");
	document.write("<table width='183' border='0' cellpadding='0' cellspacing='0'>");
	for(h=0;h<leftLayerList.length;h++)
	{
		document.write("<tr><td class='thirdmenu' onmouseover=\"showLeftPic("+num+","+h+");\" onmouseout=\"hideLeftPic("+num+");\"  height='19'>");
		if(leftLayerHttpList[h]==""  || leftLayerHttpList[h]==0)
		document.write("&nbsp;<span class='"+ leftLayerHttpStyleList[h] +"'>"+leftLayerList[h]+"</span></td></tr>");
		else
		document.write("&nbsp;<a href='/study/study.php?id="+ leftLayerHttpList[h]+"'  class='"+ leftLayerHttpStyleList[h] +"'>"+leftLayerList[h]+"</a></td></tr>");
		//document.write("<tr><td height=8></td></tr>");
	}
	document.write("</table></div>");

	document.write("</td>");
	document.write("</tr></table>");
	
	document.write("</td></tr></table></div>");
}


//显示第num个子菜单，其它关闭.
function showLeftmenuLeftItem(num)
{
for(var i=0;i<leftLayer.length;i++)
{
	var itemID=layerLeftName+i;
	var menuLeftItemID=menuLeftItem+i;
	var tbgimg="images/leftmenu1.gif";
	var leftLayerList=eval("subLeftLayer"+i);
	var leftLayerItemColor="";
	if (leftLayerList.length<1 || leftLayerList[0]=="")
	{
		leftLayerItemColor="#999999";
	}
	else
	{
		leftLayerItemColor="#FFFFFF";
	}
	if(i==num)
	{
		document.getElementById(itemID).style.visibility="visible";
		document.getElementById(menuLeftItemID).style.backgroundImage="url("+tbgimg+")";
		document.getElementById(menuLeftItemID).style.color="#FFFFFF";
	}
	else
	{
		document.getElementById(itemID).style.visibility="hidden";
		document.getElementById(menuLeftItemID).style.backgroundImage="none";
		document.getElementById(menuLeftItemID).style.color=leftLayerItemColor;
	}
}
if (num<leftLayer.length)
{
	document.getElementById("shadeLayer").style.visibility="visible";
}
else
{
	document.getElementById("shadeLayer").style.visibility="hidden";
}
}


function showLeftPic(num,h)
{
	var SubLeftItemPicID="SubLeftItemPic"+num;
	var tbgimg = eval("subLeftLayPic"+num)[h];
	document.getElementById(SubLeftItemPicID).style.backgroundImage="url("+tbgimg+")";
}

function hideLeftPic(num)
{
	var SubLeftItemPicID="SubLeftItemPic"+num;
	document.getElementById(SubLeftItemPicID).style.backgroundImage="";
}