var pozicija;
var screenWidth;
NS4 = (document.layers) ? 1 : 0;
DOM = (document.getElementById) ? 1 : 0;

function layerShowHide(layer, on) {
	if (on) {
		if (NS4)
			screenWidth = window.innerWidth;
		else if (DOM)
			screenWidth = (document.body.clientWidth ? document.body.clientWidth : window.innerWidth) + 18;
		else
			screenWidth = document.body.clientWidth + 18;
		
		pozicija = Math.ceil(screenWidth/2-477+150);
	
	    if (NS4)
	        document.layers[layer].left = pozicija;
	    else if (DOM)
	        document.getElementById(layer).style.left = pozicija;
	    else
	        document.all[layer].style.pixelLeft = pozicija;

		if (NS4) document.layers[layer].visibility = "show";
		else if (DOM) document.getElementById(layer).style.visibility = "visible";
        else document.all[layer].style.visibility = "visible";
	}
	else {
		if (NS4) document.layers[layer].visibility = "hide";
		else if (DOM) document.getElementById(layer).style.visibility = "hidden";
		else document.all[layer].style.visibility = "hidden";
	}
}