if (document.images) {            
       img0on = new Image();   img0on.src = "images/butthailand2.gif";
       img1on = new Image();   img1on.src = "images/buthome2.gif";
       img2on = new Image();   img2on.src = "images/butboat2.gif";
       img3on = new Image();   img3on.src = "images/butcrew2.gif";
       img4on = new Image();   img4on.src = "images/butmenta2.gif";
       img5on = new Image();   img5on.src = "images/butandaman2.gif";
       img6on = new Image();   img6on.src = "images/butthailand2.gif";
       img7on = new Image();   img7on.src = "images/butbook2.gif";
       img8on = new Image();   img8on.src = "images/butgallery2.gif";

		img0off = new Image();  img0off.src = "images/butthailand.gif";
		img1off = new Image();  img1off.src = "images/buthome.gif";
		img2off = new Image();  img2off.src = "images/butboat.gif";
		img3off = new Image();  img3off.src = "images/butcrew.gif";
		img4off = new Image();  img4off.src = "images/butmenta.gif";
		img5off = new Image();  img5off.src = "images/butandaman.gif";
		img6off = new Image();  img6off.src = "images/butthailand.gif";
		img7off = new Image();  img7off.src = "images/butbook.gif";
		img8off = new Image();  img8off.src = "images/butgallery1.gif";
 }
    function imgOn(imgName) {if (document.images) {document[imgName].src = eval(imgName + "on.src");}}
    function imgOff(imgName) {if (document.images) {document[imgName].src = eval(imgName + "off.src");}}