ie = (document.all && !window.opera);
dom = (document.getElementById && !window.opera);
opera = (window.opera);

// this will dynamically create an iframe 
// needs to be called at the onload event and target the id value of the layer we want to appear on top of active content
// it will track the layers position automatically and size and position the iframe automatically to fit the layer

function activateDivLayer(id){
	if(ie){
		el = document.getElementById(id);
		ifrm = document.createElement("IFRAME");
		ifrm.setAttribute("id", "dummyFRM");
		ifrm.setAttribute("src", "#");
		ifrm.setAttribute("scroll", "no");
		ifrm.setAttribute("frameborder", "0");
		ifrm.style.setAttribute("position", "absolute");
		ifrm.style.setAttribute("visibility", "hidden");
		// better for IE5.5 to use old filter...
		ifrm.style.filter='Alpha(opacity=0)';
		ifrm.style.width = el.offsetWidth + "px";
		ifrm.style.height = el.offsetHeight + "px";
		ifrm.style.left = el.offsetLeft + "px";
		ifrm.style.top = el.offsetTop + "px";
		ifrm.style.zIndex = el.style.zIndex-1;
		document.body.appendChild(ifrm);
 	}
}

// this hides elements 
// for opera we resize the flash movie back to original size
// arguments for the loadflash() function are id of layer, url of flash movie, width and height. 

function hideDiv(id){
	if(ie){
		document.getElementById(id).style.visibility = "hidden";
		ifrm.style.visibility = "hidden";
	}else if(dom){
		document.getElementById(id).style.visibility="hidden";
	}else if(opera){
		document.getElementById(id).style.visibility="hidden";
		/*loadFlash('flashLYR','matrix.swf',500,300);*/
	}
}

// this shows elements 
// for opera we resize the flash movie to a smaller size so as to allow the layer to show. 
// arguments for the loadflash() function are id of layer, url of flash movie, width and height. 

function showDiv(id){
	if(ie){
		document.getElementById(id).style.visibility="visible";
		ifrm.style.visibility = "visible";
	}else if(dom){
		document.getElementById(id).style.visibility="visible";
	}else if(opera){
		document.getElementById(id).style.visibility="visible";
		/*loadFlash('flashLYR','matrix.swf',500,161);*/
	}
}