var image1 = new Image();
image1.src = "support/blue-hdr-signup-on.gif";
var image2 = new Image();
image2.src = "support/blue-hdr-sponsors-on.gif";
var image3 = new Image();
image3.src = "support/blue-hdr-program-on.gif";
var image4 = new Image();
image4.src = "support/blue-hdr-points-on.gif";
var image5 = new Image();
image5.src = "support/blue-hdr-prizes-on.gif";
var image6 = new Image();
image6.src = "support/blue-hdr-myGFI-on.gif";

var imageMy1 = new Image();
imageMy1.src = "support/grn-hdr-home-on.gif";
var imageMy2 = new Image();
imageMy2.src = "support/grn-hdr-points-on.gif";
var imageMy3 = new Image();
imageMy3.src = "support/grn-hdr-events-on.gif";
var imageMy4 = new Image();
imageMy4.src = "support/grn-hdr-prizes-on.gif";
var imageMy5 = new Image();
imageMy5.src = "support/grn-hdr-sponsors-on.gif";
var imageMy6 = new Image();
imageMy6.src = "support/grn-hdr-calendar-on.gif";
var imageMy7 = new Image();
imageMy7.src = "support/grn-hdr-news-on.gif";
var imageMy8 = new Image();
imageMy8.src = "support/btn-logpts-on.gif";
var imageMy9 = new Image();
imageMy9.src = "support/btn-savpts-on.gif";


function chgButton(oImg, nImgType){
    var sSrc = oImg.src;
    var nPos = sSrc.lastIndexOf("-");
    var sImgType;
    if (nImgType == 1){
        sImgType = ".gif";
    } else{
        sImgType = ".jpg";
    }
    
    if (nPos > 0){
        var sImgSuffix = sSrc.substr(nPos, sSrc.length);
        var sSrcBase = sSrc.substr(0, nPos);
        if (sImgSuffix == "-off" + sImgType){
            oImg.src = sSrcBase + "-on" + sImgType;
            return(true);
        }else if (sImgSuffix == "-on" + sImgType) {
            oImg.src = sSrcBase + "-off" + sImgType;
            return(true);
        }
    }
}