var imgNum = 0;

function makeTable(line) { 
	var ColTable = '';
	ColTable += '<table cellpadding="0" cellspacing="0" border="0" width="310" height="310" bgcolor="#ffffff" valign="top">';
	ColTable += '<tr><td align="center" valign="middle" >';
	ColTable += '<img src = "images/nws/nwscol/big/' + line + '.jpg" height="308" width="308" border="0"></td>';
	ColTable += '</tr></table>';
	return ColTable;	
}



var activeNavigation = null;
var activeProduct = null;
var timeoutId = 0;
var currentSection = "";







function showTable(idName) {
	
  var element = '';
	if (activeProduct != null){
		element = returnDhtmlFeature(activeProduct);
		if (element) {
			element.visibility = changeElementVisibility(activeProduct, 'disable');
		
		}
	}
	if (validateArg(idName)) {
		activeProduct = idName;
		element = returnDhtmlFeature(activeProduct);
		if (element) {
			element.visibility = changeElementVisibility(activeProduct, 'enable');
		
		}
	}
}

function returnDhtmlFeature(arg) {
	var feature = null;
	if (document.all) { // IE 4/5
		feature = document.all(arg).style;
	}
	else if (document.layers) { // N4
		feature = document.layers[arg];
	}
	else if (document.getElementById) { // NS
		feature = document.getElementById(arg).style;
	}
	return feature;
}

function changeElementVisibility(idName, state) {  // change visibility of passed element
	var changeVisibilityTo = "";
	if (document.all || document.getElementById) { // IE & NS
		if (state == "enable" )
			 changeVisibilityTo = "visible";
		else changeVisibilityTo = "hidden";
	}
	else if (document.layers) { // N4
		if (state == "enable")
			 changeVisibilityTo = "show";
		else changeVisibilityTo = "hide";
	}
	return changeVisibilityTo;
}

function swapImg(imgname, imgpath) {  // rollover script
	if (document.images) {
		if ((document.layers) && (!validateArg(document.images[imgname]))) {
			var obj = parseLayers(document, imgname, 'images');
			obj.src = imgpath;
			}
		else {
			eval('document.images.' + imgname + '.src="' + imgpath +'"');
		}
	}
}

function validateArg(arg) {  // get boolean values for function arguments
	if ((arg == "undefined") || (arg == null)) return false;
	else return true;
}

function parseLayers(obj, name, type) {
	var typeObj = null;
	for (var i = 0; i < obj.layers.length; i++) {
		if (type == 'images') typeObj = obj.layers[i].document.images;
		else if (type == 'anchors') typeObj = obj.layers[i].document.anchors;
		for (var j = 0; j < typeObj.length; j++) {
			if (typeObj[j].name == name) {
				return typeObj[j];
				break;
			}
		}
		parseLayers(obj.layers[i], name, type);
	} 
}