function preload(imgName,imgSrc) 
{
    
if (document.images) 
	{
	eval(imgName+' = new Image()')
	eval(imgName+'.src = "'+imgSrc+'"')
  	}
}

preload('nav1off','images/mainmenue_startseite1.gif')
preload('nav1on','images/mainmenue_startseite2.gif')

preload('nav2off','images/mainmenue_produkte1.gif')
preload('nav2on','images/mainmenue_produkte2.gif')

preload('nav3off','images/mainmenue_support1.gif')
preload('nav3on','images/mainmenue_support2.gif')


preload('nav5off','images/mainmenue_news1.gif')
preload('nav5on','images/mainmenue_news2.gif')

preload('nav6off','images/mainmenue_konto1.gif')
preload('nav6on','images/mainmenue_konto2.gif')

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


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