function Menu(pageID){

	//dynamic properties
	this.pageID = pageID;
	//methodes
	this.overItem = _overItem;
	this.outItem = _outItem;
	this.toggleSite = _toggleSite;
	this.init = _init;
}
function _init(){
	document.images['btn_'+this.pageID].src = 'imgs/btn_'+this.pageID +'_h.gif';
} 
function _overItem(itemID){
	//document.images['btn_'+this.pageID].src = 'imgs/btn_'+this.pageID +'_l.gif';
	document.images['btn_'+itemID].src = 'imgs/btn_'+itemID +'_o.gif';		
} 
function _outItem(itemID){
	document.images['btn_'+itemID].src = 'imgs/btn_'+itemID +'_l.gif';
	this.init();
}
function _toggleSite(itemID){
	if(itemID != this.pageID || itemID == 'produkte'){
		location.href =  itemID+'.htm';
	}
}