function getObj(name) {
	
	if (document.getElementById)  { 
	 	this.obj = document.getElementById(name);
		this.style = document.getElementById(name).style;
	}  else if (document.all)   {
		this.obj = document.all[name];
		this.style = document.all[name].style;
	}  else if (document.layers) {
		this.obj = document.layers[name];
		this.style = document.layers[name];
	}
}
var cl1 = 0; var cl2 = 0; var cl3 = 0;

function navi(io,id) {
		nav_id = 'nav'+id;
		out = cl1 +" / " +cl2  +" / " +cl3;
	//	alert(out);
		var ID = new getObj(nav_id);
		if ((nav_id != cl1) &  (nav_id != cl2) &  (nav_id != cl3)){
			if(io ==1) ID.obj.src = "pix/"+id+"_2.gif";
			else ID.obj.src = "pix/"+id+"_1.gif";
		}		
}