// JavaScript Document


function getInternetExplorerVersion()
// Returns the version of Internet Explorer or a -1
// (indicating the use of another browser).
{
  var rv = -1; // Return value assumes failure.
  if (navigator.appName == 'Microsoft Internet Explorer')
  {
    var ua = navigator.userAgent;
    var re  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
    if (re.exec(ua) != null)
      rv = parseFloat( RegExp.$1 );
  }
  return rv;
}



function cambia(id,hi)
{
	var ver=getInternetExplorerVersion();
	if(ver!=-1)
	{
		if(ver<7) return;
	}
	var tmp=document.getElementById('btn'+id+'_1').style.display;
	
	document.getElementById('btn'+id+'_1').style.display=document.getElementById('btn'+id+'_2').style.display;
	document.getElementById('btn'+id+'_2').style.display=tmp;
}