var myimages=new Array();
	
function preloadImgs(){
	for (i=0;i<preloadImgs.arguments.length;i++){
		myimages[i]=new Image();
		myimages[i].src="images/" + preloadImgs.arguments[i];
	}
}

//preload left main nav
preloadImgs("nav_a_on.gif", "nav_b_on.gif", "nav_c_on.gif", "nav_d_on.gif");


function swapImg(img1,img2) {
	if (document.images) {
		document[img1].src = img2;
	}
}

if (document.layers || document.all || document.getElementById) canDoLayers=true;
	else canDoLayers=false;

function hideLayer(layerName) {
	if (canDoLayers) {
		if (document.layers) document.layers[layerName].visibility = 'hidden';
		else if (document.all) document.all[layerName].style.visibility = 'hidden';
		else if (document.getElementById) document.getElementById(layerName).style.visibility = 'hidden';
	}
}
	
function showLayer(layerName) {
	if (canDoLayers) {
		if (document.layers) document.layers[layerName].visibility = 'visible'; 
		else if (document.all) document.all[layerName].style.visibility = 'visible';
		else if (document.getElementById) document.getElementById(layerName).style.visibility = 'visible';
	}
}
function textTour(current,changeTo) {
	if (canDoLayers){
		hideLayer('page'+current);
		showLayer('page'+changeTo);
	}
}
function popWindow(url, name, intWidth, intHeight)
{
	winParameters = "width=" + intWidth + ",height=" + intHeight + ",scrollbars=no";
	popupWin = window.open(url, name, winParameters);
	popupWin.focus();
	return false;
}