function setImage(path,img){
	var r1=0;
	var r=0;
	var t=0;
	do{var num = Math.random();r1=Math.round((img - 1) * num) + 1;}
	while(r1==r);
	r = r1;
	document.getElementById("head").style.backgroundImage="url('"+path+"head"+r+".jpg')";
}