function preloader() {
	// counter
	var i = 0;
	
	// create object
	imageObj = new Image();

	// set image list
	images = new Array();
	images[0]="/images/nav_am_off.gif";
	images[1]="/images/nav_am_on.gif";
	images[2]="/images/nav_gt_off.gif";
	images[3]="/images/nav_gt_on.gif";
	images[4]="/images/nav_p_off.gif";
	images[5]="/images/nav_p_on.gif";
	images[6]="/images/nav_rn_off.gif";
	images[7]="/images/nav_rn_on.gif";
	images[8]="/images/nav_sag_off.gif";
	images[9]="/images/nav_sag_on.gif";
	
	// start preloading
	for(i=0; i<=9; i++) {
		imageObj.src=images[i];
	}
}