var loaded = false;
if (document.images) {
    img1off = new Image();img1off.src = "images/logo_prommitr_off.gif";
    img2off = new Image();img2off.src = "images/logo_saha_off.gif";
    img3off = new Image();img3off.src = "images/logo_true_off.gif";
	img4off = new Image();img4off.src = "images/logo_711_off.gif";
	img5off = new Image();img5off.src = "images/logo_thaiair_off.gif";
	img6off = new Image();img6off.src = "images/logo_siamcom_off.gif";
}
function imageLoad() {
    if (document.images) {
    img1on = new Image();img1on.src = "images/logo_prommitr_on.gif";
    img2on = new Image();img2on.src = "images/logo_saha_on.gif";
    img3on = new Image();img3on.src = "images/logo_true_on.gif";
	img4on = new Image();img4on.src = "images/logo_711_on.gif";
    img5on = new Image();img5on.src = "images/logo_thaiair_on.gif";
	img6on = new Image();img6on.src = "images/logo_siamcom_on.gif";
	
        return (loaded = true);
    }
}
function rollOut(imgName) {
    if (document.images) {
        document[imgName].src = eval(imgName+"off.src");
    }
}
function rollIn(imgName) {
    if (document.images && (loaded == true)) {
        document[imgName].src = eval(imgName+"on.src");
    }
}