function menu(idMenu){		
if (!document.getElementById(idMenu)) return;
		var DokI = document.getElementById(idMenu).getElementsByTagName('img');

		for(i=0;i<DokI.length; i++){
			if(DokI[i].className != "active" ){	
				DokI[i].onmouseover = function(){
                    this.src = 
                        this.src.substring(0,this.src.lastIndexOf(".")) 
                        +"_a"+ this.src.substring(this.src.lastIndexOf("."), this.src.length)
                }
				DokI[i].onmouseout = function(){
                    if (this.src.substring(this.src.lastIndexOf(".")-2, this.src.lastIndexOf("."))=='_a')
                    this.src = 
                        this.src.substring(0,this.src.lastIndexOf(".")-2)
                        +this.src.substring(this.src.lastIndexOf("."), this.src.length)
                }
			}
		}
		
	}
window.onload = function(){	
	menu('Menu_left');
	menu('Dop_menu_left');
	menu('TopMenu');
	menu('MenuCenter');
	menu('MenuCenterU2');
}