/**
 * @author Administrator
 */

function SetCookie(name, value) 
{
    document.cookie = escape(name) + "=" + escape(value) + "; path=/";	
}

function GetCookie (name) 
{
  var exp = new RegExp (escape(name) + "=([^;]+)");
  if (exp.test (document.cookie + ";")) {
    exp.exec (document.cookie + ";");
    return unescape(RegExp.$1);
  }
  else return false;
}

function GetRandomImage(imageArr, height, width, altTag) 
{		
	
	var index;
	
	if (!(index = GetCookie("RandomImageIndex"))) 
	{	
		index = GetRandomIndex(imageArr.length);
		SetCookie("RandomImageIndex", index);	
		
	}
		
		
	document.write(
		'<div class="collagepadding"><img src="' + imageArr[index] 
		+ '" width="' + width 
		+ '" height="' + height
		+ '" alt="' + altTag
		+ '" border="0"/></div>');
}

function GetRandomIndex(length)
{
	return Math.floor(Math.random() * length); 
}