function showLayer(name, ypos, xpos) {
 if(ypos!=undefined){ ypos=ypos } else { ypos=50; }
 if(xpos!=undefined){ xpos=xpos } else { xpos=230; }
  if(document.documentElement.scrollTop){
    document.getElementById(name).style.top=(document.documentElement.scrollTop+ypos)+"px";
  } else {
    document.getElementById(name).style.top=ypos+"px";
  }
 document.getElementById(name).style.left=xpos+"px";
 document.getElementById(name).className='visibleLayer';
}


function hideLayer(name) {
 document.getElementById(name).className = 'hiddenLayer';

}
function popup(urll,name,width,height) {
 var a = window.open(urll, name, 'width='+width+',height='+height+',left=0,top=0,status=no,scrollbars=no,toolbar=no');
}