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('');
}
}