if (top.location !=self.location) {
		top.location.replace(self.location)
	}

	if (document.images) {

		about = new Image; aboutover = new Image; serv = new Image; servover = new Image;
		proj = new Image; projover = new Image; contact = new Image; contactover = new Image;
    prin = new Image; prinover = new Image; staff = new Image; staffover = new Image;
		geotech = new Image; geotechover = new Image; drilling = new Image; drillingover = new Image;
		lab = new Image; labover = new Image; comt = new Image; comtover = new Image;

		about.src = "images/about-off.gif"; aboutover.src = "images/about-on.gif"
    serv.src = "images/serv-off.gif"; servover.src = "images/serv-on.gif"
    proj.src = "images/proj-off.gif"; projover.src = "images/proj-on.gif"
    contact.src = "images/contact-off.gif"; contactover.src = "images/contact-on.gif"
    prin.src = "images/prin-off.gif"; prinover.src = "images/prin-on.gif"
    staff.src = "images/staff-off.gif"; staffover.src = "images/staff-on.gif"
		geotech.src = "images/geotech-off.gif"; geotechover.src = "images/geotech-on.gif"
		drilling.src = "images/drilling-off.gif"; drillingover.src = "images/drilling-on.gif"
		lab.src = "images/lab-off.gif"; labover.src = "images/lab-on.gif"
		comt.src = "images/comt-off.gif"; comtover.src = "images/comt-on.gif"


	}
	function chgImg(imgField,newImg) {
		if (document.images) {
			document[imgField].src = eval(newImg + ".src")
		}
	}