var imgs = new Array();

function cache(imgName) {
	var img = new Image();
	img.src = imgName;
	imgs[imgs.length] = img;	
}

function swap(imgId, imgName) {
	if (document.images) {
		var img = getObjectById(imgId);
		if (img) img.src = imgName;
	}
}

function visible(divName) {
	styleObj = getStyleById(divName);
	styleObj.visibility='visible';	
}

function invisible(divName) {
	styleObj = getStyleById(divName);
	styleObj.visibility='hidden';
}

function setZIndex(divName, z) {
	styleObj = getStyleById(divName);
	styleObj.zIndex = z;	
}

function isTop(divName) {
	styleObj = getStyleById(divName);
	return styleObj.zIndex == '2';
}

function top(divName) {
	setZIndex(divName,2);
}

function bottom(divName) {
	setZIndex(divName,1);
}

function isDisplayed(divName) {
	styleObj = getStyleById(divName);
	return styleObj.display == 'block';	
}

function display(divName) {
	styleObj = getStyleById(divName);
	styleObj.display='block';	
}

function undisplay(divName) {
	styleObj = getStyleById(divName);
	styleObj.display='none';	
}

function mostrar(divName) {
	styleObj = getStyleById(divName);
	if (styleObj.display == 'block') {
		styleObj.display='none';
	} else {
		styleObj.display='block';	
	}
}

function BC(obj, color) {
	obj.style.backgroundColor = color;
	obj.style.cursor = 'Hand';
}

var pop_wnd;

function pop(url, title, width, height, scroll, resize) {
	var args = 'toolbar=no,location=no,directories=no,status=no,menubar=no,';
	args += 'scrollbars=' + scroll + ',resizable=' + resize + ',width=' + width + ',height=' + height;
	pop_wnd = window.open(url,title,args);
	pop_wnd.focus();
	void(1);
}