Ive created a theme for an smf forum called Verve but when i try to validate the css @ http://jigsaw.w3.org/css-validator i get the following errors

2561 	tr.windowbg td, tr.windowbg2 td, tr.approvebg td, tr.highlight2 td 	Property text-shadow doesn't exist in CSS level 2.1 but exists in : 1px 2px 1px #000000 1px 2px 1px #000000
3564 	#userarea 	Property text-shadow doesn't exist in CSS level 2.1 but exists in : 1px 2px 1px #000000 1px 2px 1px #000000
3567 	#userarea 	Property border-radius doesn't exist in CSS level 2.1 but exists in : 5px 5px
3661 	#topnav li a 	Property text-shadow doesn't exist in CSS level 2.1 but exists in : 1px 1px 1px #000000 1px 1px 1px #000000
3668 	#topnav li a.active 	Property text-shadow doesn't exist in CSS level 2.1 but exists in : 0 1px 0 #1d1d1d 0 1px 0 #1d1d1d
3674 	#topnav li a:hover, #topnav li:hover a, #topnav li.sfhover a 	Property text-shadow doesn't exist in CSS level 2.1 but exists in : 0 1px 0 #1d1d1d 0 1px 0 #1d1d1d
3679 	#topnav li:hover li a, #topnav li ul li a:hover 	Property text-shadow doesn't exist in CSS level 2.1 but exists in : 0 1px 0 #1d1d1d 0 1px 0 #1d1d1d
3695 	#topnav li li a, #topnav li li a:hover, #topnav li li a, #topnav a.active li a, #topnav li:hover li a, #topnav li.sfhover li a 	Property text-shadow doesn't exist in CSS level 2.1 but exists in : 0 1px 0 #1d1d1d 0 1px 0 #1d1d1d
3734 	#footerarea 	Value Error : padding -1.0 negative values are not allowed : -1em -1em

The thing is i need text shadows to make the theme what it is, you can view the theme @ http://www.themehut.co.cc and select the verve theme in the theme changer
How can i fix theses errors without having to remove the text shadows?

Looks pretty straightforward to me, you're trying to use CSS3 properties and the validator is simply telling you that those properties are not valid in CSS 2.1.

As for the last, it's pretty clear - you cannot have NEGATIVE padding.