var mactive='none';
var mclick='none';

docu='';
showlayer='';
IE=false;

if (navigator.appName == "Netscape"){
	if ( navigator.appVersion.substring(0, 4) >= "3.0" )
                docu=document.layers;
                showlayer='show';
		IE=false;
	}


if (navigator.appName == "Microsoft Internet Explorer"){
	if ( navigator.appVersion.substring(22, 26) >= "4.0" )
                docu=document.all;
                showlayer='visible';
		IE=true;
	}
	
function popup(URL){
	popupWin = window.open(URL, 'popup', 'height=410,width=640,screenX=50,screenY=50, left=50, top=50')
}


function LightOnIcon(icon){
  	var iconlayer=icon+'lay1';
	docu[iconlayer].document.images[icon].src = 'gfx/main/' + icon + '2.gif';
}

function LightOffIcon(icon){
	var iconlayer=icon+'lay1';
	docu[iconlayer].document.images[icon].src = 'gfx/main/' + icon + '.gif';
}


function ShowMenu(mclick){
	if (IE)
	{
		docu.wdlay2.style.visibility='hidden';
	 	docu.crlay2.style.visibility='hidden';
	 	docu.nwlay2.style.visibility='hidden';
	 	docu.ablay2.style.visibility='hidden';
	 	docu.lklay2.style.visibility='hidden';
		
		showlay = mclick+'lay2';
		docu[showlay].style.visibility=showlayer;
	 	docu.crlay1.style.top=40;
	 	docu.nwlay1.style.top=65;
	 	docu.ablay1.style.top=90;
	 	docu.lklay1.style.top=115;
	 	
	 	if (mclick == mactive){
			 	docu[showlay].style.visibility='hidden';
			 	mactive='none';
			 	mclick='none';
		}
		
		switch (mclick){
			case 'wd':
			 	docu.crlay1.style.top=85;
			 	docu.nwlay1.style.top=110;
			 	docu.ablay1.style.top=135;
			 	docu.lklay1.style.top=160;
				mactive=mclick;
				break;
			case 'cr':
			 	docu.nwlay1.style.top=135;
			 	docu.ablay1.style.top=160;
			 	docu.lklay1.style.top=185;
				mactive=mclick;
				break;
			case 'nw':
			 	docu.ablay1.style.top=110;
			 	docu.lklay1.style.top=135;
				mactive=mclick;
				break;
			case 'ab':
			 	docu.lklay1.style.top=145;
				mactive=mclick;
				break;
			case 'lk':
				mactive=mclick;
				break;
			default :
			 	break;
		}
	}else
	{
		docu.wdlay2.visibility='hidden';
	 	docu.crlay2.visibility='hidden';
	 	docu.nwlay2.visibility='hidden';
	 	docu.ablay2.visibility='hidden';
	 	docu.lklay2.visibility='hidden';
		
		showlay = mclick+'lay2';
		docu[showlay].visibility=showlayer;
	 	docu.crlay1.top=40; 
	 	docu.nwlay1.top=65; 
	 	docu.ablay1.top=90; 
	 	docu.lklay1.top=115;

	 	if (mclick == mactive){
			 	docu[showlay].visibility='hidden';
			 	mactive='none';
			 	mclick='none';
		}
		
		switch (mclick){
			case 'wd':
			 	docu.crlay1.top=85; 
			 	docu.nwlay1.top=110;
			 	docu.ablay1.top=135;
			 	docu.lklay1.top=160;
				mactive=mclick;
				break;
			case 'cr':              
			 	docu.nwlay1.top=135;
			 	docu.ablay1.top=160;
			 	docu.lklay1.top=185;
				mactive=mclick; 
				break;
			case 'nw':
			 	docu.ablay1.top=110;
			 	docu.lklay1.top=135;
				mactive=mclick;
				break;
			case 'ab':
			 	docu.lklay1.top=145;
				mactive=mclick;
				break;
			case 'lk':
				mactive=mclick;
				break;
			default :
			 	break;

		}
		

	}
}