// nav image flips
function preloadImages() {
		  if (document.images) {
		    var imgFiles = preloadImages.arguments;
			var preloadArray = new Array();
			for (var i=0; i<imgFiles.length; i++) {
			preloadArray[i] = new Image;
			preloadArray[i].src = imgFiles[i];
		    }
		  }
		}
preloadImages('/images/header/nav1_off.gif');preloadImages('/images/header/nav2_off.gif');preloadImages('/images/header/nav3_off.gif');preloadImages('/images/header/nav4_off.gif');preloadImages('/images/header/nav5_off.gif');preloadImages('/images/header/nav6_off.gif');preloadImages('/images/header/nav7_off.gif');
		preloadImages('/images/header/nav1_on.gif');preloadImages('/images/header/nav2_on.gif');preloadImages('/images/header/nav3_on.gif');preloadImages('/images/header/nav4_on.gif');preloadImages('/images/header/nav5_on.gif');preloadImages('/images/header/nav6_on.gif');preloadImages('/images/header/nav7_on.gif');

// set button on/off
var flag = 0;			//global variable
function setButton(id) {
	if (id == "") return;
	if(pageId != 0) {
		if (eval('document.images["nav' + pageId + '"]').src != eval('document.images["' + id + '"]').src)
		setImg(id); 
	}
	else
	setImg(id);
}

// set the right image
function setImg(id) {
	if (flag == 0) {
		eval('document.images["' + id + '"]').src='/images/header/' + id + '_on.gif';
		flag = 1;
	}
	else {
		eval('document.images["' + id + '"]').src='/images/header/' + id + '_off.gif';
		flag = 0
	}
}
function setPage() {
	var id = pageId;
	if(id != 0)
	eval('document.images["nav' + id + '"]').src='/images/header/nav' + id + '_on.gif';
}