var btnWid = 171;
var btnHgt = 22;
var numBtns = btnUrl.length;
var BtnsLoaded = false;

// load button images
function loadButtons() {
	button = new Array();
	button[0] = new Image();
	button[0].src = "media/menu_off.png";
	button[1] = new Image();
	button[1].src = "media/menu_on.png";
	button[2] = new Image();
	button[2].src = "media/menu_over.png";
	for(arg=0; arg<numBtns; arg++) {
		if(arg == currBtn) {
			imageAssign(arg,1);
		} else {
			imageAssign(arg,0);
		}
	}
	BtnsLoaded = true;
}

// mouseover button function
function imageChange(objNum,objStatus) {
		if(objNum != currBtn) {
			imageAssign(objNum,objStatus);
		}
}

// assign button image
function imageAssign(objNum,objStatus) {
	document.getElementById('btn' + objNum).style.background = "url("+button[objStatus].src+")";
}

// build menu
btnBlock = '';
currBtn = -1;
for (var btnNum=0; btnNum<numBtns; btnNum++){
	if (btnUrl[btnNum] == thisPage) {
		currBtn = btnNum;
	}
	btnBlock = btnBlock + '<TR><TD><IMG SRC="media/shim.gif" WIDTH="1" HEIGHT="' + btnHgt + '"></TD>';
	btnBlock = btnBlock + '<TD><TABLE ID="btn' + btnNum + '" BACKGROUND="media/menu_';
	btnNum == currBtn ? btnBlock = btnBlock + '1' : btnBlock = btnBlock + '0';
	btnBlock = btnBlock + '.png" WIDTH="100%" CELLSPACING="0" CELLPADDING="5" BORDER="0"><TR><TD>';
	if(btnNum == currBtn) {
		btnBlock = btnBlock + '<SPAN CLASS="mainmenu">';
	} else {
		btnBlock = btnBlock + '<A HREF="' + btnUrl[btnNum] + '"';
		btnBlock = btnBlock + ' ONMOUSEOVER="imageChange(\'' + btnNum + '\',\'2\')"';
		btnBlock = btnBlock + ' ONMOUSEOUT="imageChange(\'' + btnNum + '\',\'0\')"';
		btnBlock = btnBlock + ' TITLE="' + btnAlt[btnNum] + '" CLASS="mainmenu">';
	}
	btnBlock = btnBlock + '&nbsp;&nbsp;&nbsp;&nbsp;' + btnTtl[btnNum];
	btnNum == currBtn ? btnBlock = btnBlock + '</SPAN>' : btnBlock = btnBlock + '</A>';
	btnBlock = btnBlock + '</TD></TR></TABLE></TD></TR>';
}