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Serving different css box shadows for different browsers without browser detection?

I noticed that each browsers renders box shadow blur radius slightly different so I want to even that out. However, as they use the unprefixed version I need to serve different stylesheets for different browsers. What is the most reliable method?
For example: Mozilla uses moz_style.css, Chrome uses chrome_style.css
Im doing this using user agent detection but I heared it is not very reliable:
<script>
if(BrowserDetect.browser=="Chrome") {
document.write('<link rel="stylesheet" href="css/chrome.css" type="text/css" media="all" />')
}
</script>

Surely box-shadow as a CSS property already makes use of vendor prefixes for a few different browsers. If you take a look at this random box-shadow snippet I pulled from elsewhere on the web you'll see that it uses different declarations for webkit, firefox on top of the primary box shadow property:
-moz-box-shadow: inset 0 0 10px #000000;
-webkit-box-shadow: inset 0 0 10px #000000;
box-shadow: inset 0 0 10px #000000;
I know for example that the Opera vendor prefix is -o so you may be able to append that vendor prefix to the box shadow property to cover Opera browsers although I am not sure if it's supported. Also you have IE specific box shadow rules as well:
.ieShadow{
display:block;
position:absolute;
z-index:2;
top:5px;
left:5px;
right:-5px;
bottom:-5px;
filter:progid:DXImageTransform.Microsoft.Blur(pixelradius=5);
-ms-filter:"progid:DXImageTransform.Microsoft.Blur(pixelradius=5)";
background-color:#444;
}
Browser "Sniffing" with Javascript is not seen to be the way go anymore to detect browsers.
So yes all in all, surely your box shadow code can just vary from one vendor prefixed property to another?
EDIT: Some enlightenment on the subject reveals that it really isn't all that simple. Vendor prefixes are a bit of a mess really.
This gives you a good idea of the browsers using the webkit engine and the main box-shadow property:
.box_shadow {
-webkit-box-shadow: 0px 0px 4px 0px #ffffff; /* Android 2.3+, iOS 4.0.2-4.2, Safari 3-4 */
box-shadow: 0px 0px 4px 0px #ffffff; /* Chrome 6+, Firefox 4+, IE 9+, iOS 5+, Opera 10.50+
}
So I guess specific browser targeting is not achievable with vendor prefixes in CSS (??!)

Curved corners IE 7,8 Issue

i tried to set border radius to a td element, but it isn't work on IE7 and IE8
i tried all possible solutions but it still not working
here's my css classs :
padding: 5 5 5 5;
background-color: gray;
-webkit-border-radius: 5px;
-moz-border-radius: 5px;
border-radius: 5px;
-moz-box-shadow: 0 0 5px 5px #888;
-webkit-box-shadow: 0 0 5px 5px#888;
box-shadow: 0 0 5px 5px #888;
zoom: 1;
filter: alpha(opacity=70);
opacity: 0.7;
behavior: url(../Bin/PIE.htc);
i tried to use PIE.js and it also not working.

IE7 and IE8 don't support CSS3 rounded corners. You will need to look to other IE specific solutions if you want to emulate this.
How to create rounded corners in ie 8 and < is one method using .htc controls for IE.
I need to add that no solution to your problem I have ever found is 100% they all have drawbacks and can never have the full functionality that CSS3 offers.

3D effect on image

This is what i want to achive with some web technology:
example http://img171.imageshack.us/img171/2585/decacb00845442de800a5c5.png
I need to add 3d effect to 2d image, to show "depth" of image, like it is real 3d object. But i have no idea what to use to make something like this (jquery plugin, some other js libary...)? Can someone give me some basic directions? I saw this is possible on poster.com and simialr sites but cant figure out what to do.
Ofc, i don want to steal scripts from that sites :)

HTML:
<img src="http://lorempixel.com/400/200" alt /><div class="cubus"></div>​
css:
div.cubus
{
height:200px;
width: 17px;
margin-top:-5px;
box-shadow: inset -10px -8px 16px -9px #CCC;
transform:skew(0, -30deg);
-ms-transform:skew(0, -30deg); /* IE 9 */
-moz-transform:skew(0, -30deg); /* Firefox */
-webkit-transform:skew(0, -30deg); /* Safari and Chrome */
-o-transform:skew(0, -30deg); /* Opera */
float:left;
}
img{float:left;}
Demo:
http://jsfiddle.net/ewz3E/

Web-kit css div shadow: is it possible to put it onto div with pure css or images are needed?

So what I need is simple: user presses something, user sees a shadow effect on new div (div centered window) on top of all page (with 1/4 size for example) alike
Is it possible with some pure web-kit css art? Or javascript+images combination is needed? And how to do such thing?

What you are looking for can be called a modal window. It can be done using CSS3 properties, but it is supported only in IE9+, Firefox 4, Chrome, and Opera.
For a cross-browser solution, you should look at javascript scripts which can render the same effect. There are many popular packages like Lightbox, ShadowBox, ThickBox, FaceBox, etc.
If you are using ASP.NET, there is the ModalPopupExtender in the AJAXToolkit, which will give you the effect.

You need two things a div for your dialog box with box-shadow and another div that lies behind your dialog box with an opacity of 50% or so. This can be done with some css in most every browser including ie. Read this article on how to get box-shadow work in all browser: http://robertnyman.com/2010/03/16/drop-shadow-with-css-for-all-web-browsers/
so your html will look like this:
<div class="overlay"/>
<div class="dialogbox">someContent</div>
and your css:
.overlay {
position:absolute;
height: 100%;
width: 100%;
/* IE 8 */
-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";
/* IE 5-7 */
filter: alpha(opacity=50);
/* Netscape */
-moz-opacity: 0.5;
/* Safari 1.x */
-khtml-opacity: 0.5;
opacity: 0.5;
}
.dialogbox{
width: 200px;
height: 150px;
margin: auto;
-webkit-box-shadow: 3px 3px 4px #000;
box-shadow: 3px 3px 4px #000;
/* For IE 8 */
-ms-filter: "progid:DXImageTransform.Microsoft.Shadow(Strength=4, Direction=135, Color='#000000')";
/* For IE 5.5 - 7 */
filter: progid:DXImageTransform.Microsoft.Shadow(Strength=4, Direction=135, Color='#000000');
}

From this quote:
Web-kit css div shadow: is it possible
to put it onto div with pure css
and this one:
user sees a shadow effect on new div
It seems as though you're asking if it's possible to create the "shadow" effect around the inner div using CSS.
Chrome's settings page is using CSS3's box-shadow to do this:
-webkit-box-shadow: 0 5px 80px #505050;
box-shadow works in these browsers: http://caniuse.com/css-boxshadow
and the cross-browser CSS is:
-webkit-box-shadow: 0 5px 80px #505050;
-moz-box-shadow: 0 5px 80px #505050;
box-shadow: 0 5px 80px #505050;
http://jsfiddle.net/XHAbV/
If you need it to work in older versions of IE, you can use CSS3 PIE to emulate the box-shadow in those browsers.
If you're after the JavaScript side of how to do this (a modal window), the other answer covers it quite thoroughly.

iPhone-like jQuery Scrollbar

I'm trying to find a jQuery scrollbar that looks like the one of the iPhone: a simple black bar without the up or down buttons. I've found a few scripts but most tend to do so much more than I need. I basically have a div with a fixed height that is set on overflow:auto to which I would like to apply this scrollbar. Help would greatly be appreciated!

Matteo Spinelli has an iPhone-like scrollbar inside of his iScroll library. You should try looking into whether or not you can adopt it to your needs.

What are your browser requirements?
You should try to avoid javascript solutions since they will increase the complexity of your page. If a third-party scrollbar javascript library breaks, you will have to debug it yourself (been there, done that).
Chrome has full support for CSS3 scrollbars, something like this should make an iPhone like scrollbar
::-webkit-scrollbar {
width: 12px;
}
::-webkit-scrollbar-track {
-webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.3);
border-radius: 10px;
}
::-webkit-scrollbar-thumb {
border-radius: 10px;
-webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.5);
}
IE allows styling scrollbars with vendor specific tags, but its very limited. e.g.:
scrollbar-base-color: #663366;
scrollbar-face-color: #99CCCC;
scrollbar-track-color: #996699;
scrollbar-arrow-color: #330033;
scrollbar-highlight-color: #FFFFFF;
scrollbar-3dlight-color: #CCCCCC;
scrollbar-shadow-color: #663366;
scrollbar-darkshadow-color: #000000;
Here is a jsFiddle with the styled scrollbars:
http://jsfiddle.net/APmLZ/3/