if (/Firefox[\/\s](\d+\.\d+)/.test(navigator.userAgent)){ //test for Firefox/x.x or Firefox x.x (ignoring remaining digits);
 var ffversion=new Number(RegExp.$1) // capture x.x portion and store as a number
 if (ffversion>=3)
  document.write("")
 else if (ffversion>=2)
  document.write("")
 else if (ffversion>=1)
  document.write("")
}
else 
 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>=8)
  document.write("")
 else if (ieversion>=7)
  document.write("")
 else if (ieversion>=6)
  document.write("")
 else if (ieversion>=5)
  document.write("")
}
else if (/Opera[\/\s](\d+\.\d+)/.test(navigator.userAgent)){ //test for Opera/x.x or Opera x.x (ignoring remaining decimal places);
 var oprversion=new Number(RegExp.$1) // capture x.x portion and store as a number
 if (oprversion>=10)
  document.write("<link href=\"css/opera.css\" rel=\"stylesheet\" type=\"text/css\" />")
 else if (oprversion>=9)
  document.write("<link href=\"css/opera.css\" rel=\"stylesheet\" type=\"text/css\" />")
 else if (oprversion>=8)
  document.write("<link href=\"css/opera.css\" rel=\"stylesheet\" type=\"text/css\" />")
 else if (oprversion>=7)
  document.write("<link href=\"css/opera.css\" rel=\"stylesheet\" type=\"text/css\" />")
 else
     document.write("link href=\"css/opera.css\" rel=\"stylesheet\" type=\"text/css\" />")
}
else if (/Chrome[\/\s](\d+\.\d+)/.test(navigator.userAgent)){ 
 var gcversion=new Number(RegExp.$1)
 if (gcversion>=4)
  document.write("")
 else if (gcversion>=3)
  document.write("")
 else if (gcversion>=2)
  document.write("")
 else if (gcversion>=1)
  document.write("")
 else document.write("")
}
else if (/AppleWebKit[\/\s](\d+\.\d+)/.test(navigator.userAgent)){ 
 var sversion=new Number(RegExp.$1) 
 if (sversion>=400) //we call this one by compilation number. Anyhow, we end up with safari 4.
  document.write("")
 else if (sversion>=300)
  document.write("")
 else if (sversion>=200)
  document.write("")
 else if (sversion>=100)
  document.write("")
 else document.write("")
}else 
 document.write("") //we leave this empty for other browser.