//preload images
function preLoad() {
  if (!document.images) return;
  var ar = new Array();
  var arguments = preload.arguments;
  for (var i = 0; i < arguments.length; i++) {
    ar[i] = new Image();
    ar[i].src = arguments[i];
  }
}

// Swap Image Src

var lyrName;
function swapImg(imgObj, imgSrc, lyrName) {

	if (!lyrName) lyrName='';

	if (isNav) {document[lyrName].document.images[imgObj].src = eval(imgObj + imgSrc + '.src');}
	else {document.images[imgObj].src = eval(imgObj + imgSrc + '.src');}

}


function returnLayer(which){
	if (isNav || isExp) {
		obj = eval('document.'+pre+which);
		if (!obj) {return false;}
		else {return true;}
	}
	else if (isW3C || isOpera) {
		obj=document.getElementById(which);
		if (!obj) {return false;}
		else {return true;}
	}
}


function showLayer(which,how) {
	if (isNav || isExp) {
		eval ('document.'+pre+which+suf+'.visibility="'+how+'"');
		return;
	}
	else if (isW3C || isOpera) {
		obj=document.getElementById(which);
		obj.style.visibility=how;
	}
}

function toggleMenu(currElem,nextPos) {
			menuObj = (document.all) ? eval("document.all." + currElem + ".style") : eval("document." + currElem)
			if (toggleMenu.arguments.length == 1)
				nextPos = (parseInt(menuObj.top) == -5) ? -90 : -5
			if (document.all)
				menuObj.pixelTop = nextPos
			else
				menuObj.top = nextPos
}