function properbrowser(urlstr)
{
 
if (/MSIE (\d+\.\d+);/.test(navigator.userAgent)){ //test for MSIE x.x;
 var ieversion=new Number(RegExp.$1) // capture x.x portion and store as a number
 if (ieversion<7) {
  window.location = urlstr;
  } else if (ieversion==7) {
  window.location = "http://www.asiaholiday.co.th/ie7.html";
  }
 
}

}