function getImage(root, options){
	var file = "images/" + root + Math.round(Math.random() * (options-1)) + ".jpg"
	document.getElementById(root).src = file;
}

function addEvent(obj, evType, fn){ 
 if (obj.addEventListener){ 
   obj.addEventListener(evType, fn, true); 
   return true; 
 } else if (obj.attachEvent){ 
   var r = obj.attachEvent("on"+evType, fn); 
   return r; 
 } else { 
   return false; 
 } 
}

function showImages(){
	var spots = new Array('parkimg', 'werimg', 'riverimg');
	var num = new Array(3,4,3);
	for (i=0; i<spots.length; i++){
		document.getElementById(spots[i]).style.visibility = "visible";
	}
}

function dolist(){
	var spots = new Array('parkimg', 'werimg', 'riverimg');
	var num = new Array(3,4,3);
	for (i=0; i<spots.length; i++){
		getImage(spots[i], num[i]);
	}
	showImages();
}




addEvent(window, 'load', dolist);