// create image array for preload
function createImgArray()
{
  var imgArray = new Array('img/stark_info_logo.gif','img/nav/about_off.gif','img/nav/about_off.gif','img/nav/clients_off.gif','img/nav/clients_on.gif','img/nav/contact_off.gif','img/nav/contact_on.gif','img/nav/research_off.gif','img/nav/research_on.gif');
	preload(imgArray);
}
createImgArray();

// preload images
function preload(arg_imgArray)
{
  for (var i = 0; i < arg_imgArray.length; i ++)
	{
	  var newImage = new Image();
		newImage.src = arg_imgArray[i];
	}
}

// roll over
function chgImg(arg_img, arg_src) {
    document.images[arg_img].src = arg_src;
  }

// open window
function openWin(arg_url, arg_name, arg_width, arg_height) {
	window.open(arg_url,arg_name,'scrollbars=no,resizable=no,width=' + arg_width +  ',height=' + arg_height);
}