function showMenu(menu, from){
	divMenu = document.getElementById(menu);
	divFrom = document.getElementById(from);
	divMenu.style.left = findPosition(divFrom)[0];
	divMenu.style.top = findPosition(divFrom)[1] + document.getElementById('divMainMenu').offsetHeight;
	divMenu.style.visibility = 'visible';
}
function showSubMenu(menu, from, category) {
    divMenu = document.getElementById(menu);
    divFrom = document.getElementById(from);
    divCategory = document.getElementById(category);
    divMenu.style.left = findPosition(divFrom)[0] + 228;
    divMenu.style.top = findPosition(divCategory)[1];
    divMenu.style.visibility = 'visible';
}
function hideMenu(menu){
	divMenu = document.getElementById(menu);
	divMenu.style.visibility = 'hidden';
}
function stayMenu(menu) {
    divMenu = document.getElementById(menu);
    divMenu.style.visibility = 'visible'	
}
function findPosition( oElement ) {
  if( typeof( oElement.offsetParent ) != 'undefined' ) {
    for( var posX = 0, posY = 0; oElement; oElement = oElement.offsetParent ) {
      posX += oElement.offsetLeft;
      posY += oElement.offsetTop;
    }
    return [ posX, posY ];
  } else {
    return [ oElement.x, oElement.y ];
  }
}