// JavaScript Document I B
function showLayer(layer_id){
		document.getElementById(layer_id).style.visibility = "visible";
	}
function hideLayer(layer_id){
		document.getElementById(layer_id).style.visibility = "hidden";
	}	
	
function relativePosition(layer_id){
		document.getElementById(layer_id).style.position = "relative";
	}	

//////////////////////////////////function regulating left menu/////////////////////////////////////////

function switchLayerProps(layer_id){
		position = document.getElementById(layer_id).style.position;
		if (position == "absolute"){
				document.getElementById(layer_id).style.position = "relative"; 
				showLayer(layer_id);
			}else if(position == "relative"){
				document.getElementById(layer_id).style.position = "absolute"; 
				hideLayer(layer_id);
			}
	}
/////////////////////////////////////////////////////////////////////////////////////////////////////////	
////////////////////////////////// changing background logo on index page///////////////////////////////
function newBackground(urlImage){
		document.getElementById('logoAnime').style.backgroundImage = 'url(images/logo/' +urlImage+ ')';
	}
function resetBackground(){
		document.getElementById('logoAnime').style.backgroundImage = 'url(images/logo/sjena_logo.png)';
	}
/////////////////////////////////////////////////////////////////////////////////////////////////////////	
//////////////////////////////////function changing background image for any layer///////////////////////
function putBackImage(urlImage, layer_id){
			document.getElementById(layer_id).style.backgroundImage = 'url(' +urlImage+ ')';
	}
/////////////////////////////////////////////////////////////////////////////////////////////////////////
function switchMinusPlus(layer_id){
	bkgImg = document.getElementById(layer_id).style.backgroundImage
	if(bkgImg == "url(images/link_minus1.png)"){
		document.getElementById(layer_id).style.backgroundImage = "url(images/link_plus.png)";
	}else{
		document.getElementById(layer_id).style.backgroundImage = "url(images/link_minus1.png)";	
	}
}