var img=0;
var imgnum=4;

function RandomNumber(x, y) {
  var range = y - x + 1;
  return Math.floor(Math.random() * range) + x;
}
function drawImg() {
	var x = RandomNumber(1, 11);
	var str = '';
 	str += '<img  ALT="Enter Site" src="img/star'+x+'.jpg" width="402" height="131">';
 	document.write(str);
 	document.close();	
}