if(document.images){
//preload
var btIndexBootcampsOff = new Image; btIndexBootcampsOff.src = "img/indexnav-bootcamps-off.gif";
var btIndexBootcampsOver = new Image; btIndexBootcampsOver.src = "img/indexnav-bootcamps-on.gif";
var btIndexPersonalOff = new Image; btIndexPersonalOff.src = "img/indexnav-pt-off.gif";
var btIndexPersonalOver = new Image; btIndexPersonalOver.src = "img/indexnav-pt-on.gif";
var btIndexSportOff = new Image; btIndexSportOff.src = "img/indexnav-sport-off.gif";
var btIndexSportOver = new Image; btIndexSportOver.src = "img/indexnav-sport-on.gif";

var btBootcampsOff = new Image; btBootcampsOff.src = "img/mainnav-bootcamps-off.gif";
var btBootcampsOver = new Image; btBootcampsOver.src = "img/mainnav-bootcamps-on.gif";
var btPersonalOff = new Image; btPersonalOff.src = "img/mainnav-pt-off.gif";
var btPersonalOver = new Image; btPersonalOver.src = "img/mainnav-pt-on.gif";
var btSportOff = new Image; btSportOff.src = "img/mainnav-sport-off.gif";
var btSportOver = new Image; btSportOver.src = "img/mainnav-sport-on.gif";
}

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