function initMenu()
{
	if ( browser.isDOM1
	&& !( browser.isMac && browser.isIE )
	&& !( browser.Opera && browser.versionMajor < 7 )
	&& !( browser.isIE && browser.versionMajor < 5 ) )
	{
		// get some element
		var menu = document.getElementById('menu');
		var lis = menu.getElementsByTagName('li');

		// change the style of the menu
		menu.className="menu";

		// i am searching for ul element in li element
		for ( var i=0; i<lis.length; i++ )
		{
			
			// is there a ul element ?
			if ( lis.item(i).getElementsByTagName('ul')[0] )
			{
				// improve keyboard navigation with IE
				if ( browser.isIE )
				{
					addAnEvent(lis.item(i),'keyup',visible);
				}

				// apply the method to DOM compliant browsers
				addAnEvent(lis.item(i),'mouseover',visible);
				addAnEvent(lis.item(i),'mouseout',hidden);
				addAnEvent(lis.item(i),'blur',hidden);
				addAnEvent(lis.item(i),'focus',visible);
			}
		}
	}
}


function addAnEvent( target, eventName, functionName )
{
	// apply the method to IE
	if ( browser.isIE )
	{
		//target.attachEvent( 'on'+eventName, functionName ); // dont work properly with this
		eval('target.on'+eventName+'=functionName');
	}
	// apply the method to DOM compliant browsers
	else
	{
		target.addEventListener( eventName , functionName , true ); // true is important for Opera7
	}
}

/* hide the first ul element of the current element */
function hidden()
{
	/* setAttribute dont work correctly with IE */
	this.getElementsByTagName('ul')[0].style.visibility = "hidden";
}

/* show the first ul element of the current element */
function visible()
{
	this.getElementsByTagName('ul')[0].style.visibility = "visible";
}

/* used to improve keyboard navigation with IE */
function hiddenUl( ul )
{
	if ( browser.isIE )
	{
		var uls = ul.getElementsByTagName('ul');
		for ( var i=0; i<uls.length; i++ )
		{
			uls.item(i).style.visibility = "hidden";
		}
		ul.style.visibility = "hidden";
	}
}

// not very clean but simple
// the function can be run in the HTML for faster display
window.onload=initMenu;

function hideload () {
if (document.getElementById('navi'))
{
 var div_obj = document.getElementById('navi') ;
div_obj.style.display = "block" ;
}
return true;
}

function showlayer(nr){
	
document.getElementsByTagName('ul')[nr].style.visibility = "visible";

}

function hidelayer(nr){
	
document.getElementsByTagName('ul')[nr].style.visibility = "hidden";

}

function wechsel(num1,num2,num3,num4) {
	document.styleSheets[num1].disabled = false;
	document.styleSheets[num2].disabled = true; 
	document.styleSheets[num3].disabled = true;
	document.styleSheets[num4].disabled = true; 

}

function laden() {
	document.styleSheets[0].disabled = false;
	document.styleSheets[1].disabled = true; 
	document.styleSheets[2].disabled = true;
	document.styleSheets[3].disabled = true;
	

}

function getImage(){
	
i = Math.random(); 
i *= 19;
i = Math.ceil(i);

var b = new Array(); 
b[0] = new Image(); 
b[0].src = "img/header_index1.jpg";
b[1] = new Image(); 
b[1].src = "img/header_index2.jpg";
b[2] = new Image(); 
b[2].src = "img/header_index3.jpg";
b[3] = new Image(); 
b[3].src = "img/header_index4.jpg";
b[4] = new Image(); 
b[4].src = "img/header_index5.jpg";
b[5] = new Image(); 
b[5].src = "img/header_index6.jpg";
b[6] = new Image(); 
b[6].src = "img/header_index7.jpg";
b[7] = new Image(); 
b[7].src = "img/header_index8.jpg";
b[8] = new Image(); 
b[8].src = "img/header_index9.jpg";
b[9] = new Image(); 
b[9].src = "img/header_index10.jpg";
b[10] = new Image(); 
b[10].src = "img/header_index11.jpg";
b[11] = new Image(); 
b[11].src = "img/header_index12.jpg";
b[12] = new Image(); 
b[12].src = "img/header_index13.jpg";
b[13] = new Image(); 
b[13].src = "img/header_index14.jpg";
b[14] = new Image(); 
b[14].src = "img/header_index15.jpg";
b[15] = new Image(); 
b[15].src = "img/header_index16.jpg";
b[16] = new Image(); 
b[16].src = "img/header_index17.jpg";
b[17] = new Image(); 
b[17].src = "img/header_index18.jpg";
b[18] = new Image(); 
b[18].src = "img/header_index19.jpg";
b[19] = new Image(); 
b[19].src = "img/header_index20.jpg";

document.write("<img src='"+b[i].src+"' name='bild' width='825' height='314' border='0'></a>");	
	
}