var loaded = false;



function rolleyehealthImgs() {

  if (document.images) {

    newImage('monopOn', '../images/monoptica_conditions_o.gif');

    newImage('monopOff', '../images/monoptica_conditions.gif');

    newImage('monopatOn', '../images/monoptica_pat_info_o.gif');

    newImage('monopatOff', '../images/monoptica_pat_info.gif');

    loaded = true;

  }

}



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');

	}

}