var loaded, i;

function preload() 
{
	imgsrc = new Array();
	
	// top bar menu
     imgsrc[0] = 'images/menu01_on.gif';
	 imgsrc[1] = 'images/menu01_off.gif';
	 imgsrc[2] = 'images/menu02_on.gif';
	 imgsrc[3] = 'images/menu02_off.gif';
	 imgsrc[4] = 'images/menu03_on.gif';
	 imgsrc[5] = 'images/menu03_off.gif';
	 imgsrc[6] = 'images/menu04_on.gif';
	 imgsrc[7] = 'images/menu04_off.gif';
	 imgsrc[8] = 'images/menu05_on.gif';
	 imgsrc[9] = 'images/menu05_off.gif';
	 imgsrc[10] = 'images/menu06_on.gif';
	 imgsrc[11] = 'images/menu06_off.gif';
	 imgsrc[12] = 'images/menu07_on.gif';
	 imgsrc[13] = 'images/menu07_off.gif';
	 imgsrc[14] = 'images/menu08_on.gif';
	 imgsrc[15] = 'images/menu08_off.gif';

	imgs = new Array()
	if (document.images){
		for (i=0; i < imgsrc.length;i++){
			imgs[i] = new Image;
			if (imgsrc[i] != "undefined") {imgs[i].src = imgsrc[i];}
		}
	}
	loaded = true;
}

function swap(name, num)
{
	if ((document.images) && (loaded))
		document[name].src = imgs[num].src;
}