var base = "images/";
	var suffix = ".gif";

	if (document.images) {
		img1on = new Image();   img1on.src = base + "btnhome1" + suffix; 
		img2on = new Image();   img2on.src = base + "btnshop1" + suffix;
		img3on = new Image();   img3on.src = base + "btnmail1" + suffix;
		img4on = new Image();   img4on.src = base + "btnrecp1" + suffix;
		img5on = new Image();   img5on.src = base + "btnseeds1" + suffix;
		img6on = new Image();   img6on.src = base + "btnsauc1" + suffix;
		img7on = new Image();   img7on.src = base + "btnstuf1" + suffix;
		
		img1off = new Image();   img1off.src = base + "btnhome" + suffix; 
		img2off = new Image();   img2off.src = base + "btnshop" + suffix;
		img3off = new Image();   img3off.src = base + "btnmail" + suffix;
		img4off = new Image();   img4off.src = base + "btnrecp" + suffix;
		img5off = new Image();   img5off.src = base + "btnseeds" + suffix;
		img6off = new Image();   img6off.src = base + "btnsauc" + suffix;
		img7off = new Image();   img7off.src = base + "btnstuf" + suffix;
 	}        
	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");
		}
	}