function  toggle(obj) {
  var el = document.getElementById(obj);
  if ( el.style.display != 'none' ) {
    el.style.display = 'none';
  }
  else {
    el.style.display = '';
  }
}


function toggle_answer(question, answer) {
  toggle(answer);
  var el = document.getElementById(question);
  el.className = (el.className != 'active' ? 'active' : '');
}

function preload_images() {
	var aCategories=window.images_array;
	for(var i=0;i<aCategories.length;i++) {
		var oImage=new Image;
		oImage.src = aCategories[i];
	}
	toggle_images();
}
function toggle_images() {
	var aCats=images_array;
	var aCounter=counter;
	var aIDs=images_ids;
	for(var i=0,j=aCats.length;i<j;i++) {
		var oImg=document.getElementById(aIDs[i]);
		var iCurrent=aCounter[i];
		var iNext;
		if(iCurrent==aCats[i].length-1)
			iNext=0;
		else
			iNext=iCurrent+1;
		var aList=aCats[i];
		var sNewSrc=aList[iNext];
		aCounter[i]=iNext;
		if(sNewSrc) {
			oImg.src=sNewSrc;
		}
	}
	setTimeout("toggle_images()",3000);
}

function move(obj, x_coord, y_coord) {
  var el = document.getElementById(obj);
  el.style.top = '' + y_coord + 'px';
  el.style.left = '' + x_coord + 'px';
}



function toggle_popup(id) {
  
  move('popup' + id, posx - 167, posy - 235);
  move('popup_back' + id, posx -177, posy -245 );
  toggle('popup' + id);
  toggle('popup_back' + id);
}