var loaded = false;



function rollstoreImgs() {

  if (document.images) {

    newImage('surreyOn', '../images/counties_surrey.gif');

	newImage('kentOn', '../images/counties_kent.gif');

	newImage('hampshireOn', '../images/counties_hampshire.gif');

	newImage('londonOn', '../images/counties_london.gif');

	newImage('countiesOff', '../images/counties.gif');

  }

}



function newImage(name, fileName){

	window[name] = new Image();

	window[name].src = fileName;

}



function chgImg(imgField,newImg) {

	if (document.images && loaded) {

		document[imgField].src= eval(newImg+'.src');

	}

}