function startMenu(){
	
	elso_id = 'menu_first';
	utolso_id = 'menu_last';
	
	navRoot =  document.getElementById('nav');
	for( i = 0; i < navRoot.childNodes.length; i++ ){
		node = navRoot.childNodes[i];
		if ( node.nodeName == "LI" ){			
			
			if(node.className == 'aktiv'){
				if ( node.id != elso_id ){
					prevnode = (node.previousSibling.nodeName == 'LI') ? node.previousSibling : node.previousSibling.previousSibling;
					prevnode.className = 'menu_left';
				}
				if ( node.id != utolso_id ){
					nextnode = (node.nextSibling.nodeName == 'LI') ? node.nextSibling : node.nextSibling.nextSibling;
					nextnode.className = 'menu_right';
				}
			}
			
			
			node.onmousedown = function(){
			
				for( j = 0; j < navRoot.childNodes.length; j++ ){
					node2 = navRoot.childNodes[j];
					node2.className = '';
					if ( node2.nodeName == "LI" ){
						this.className = 'aktiv';
						
						if ( this.id != elso_id ){
							prev = (this.previousSibling.nodeName == 'LI') ? this.previousSibling : this.previousSibling.previousSibling;
							prev.className = 'menu_left';
						}
						if ( this.id != utolso_id ){
							next = (this.nextSibling.nodeName == 'LI') ? this.nextSibling : this.nextSibling.nextSibling;
							next.className = 'menu_right';
						}
						
					} // end_IF
				} // end_FOR
			
			} // end_ONMOUSEDOWN
		}
	}
}

//window.onload = startMenu;