If you want to create preview image of some pdf you have on your site, all you need is web server that has installed Imagick. If you are lucky enough to have that you can use this code:

<?
$preview = new imagick('somepdf.pdf[0]'); /* read first page of PDF */
setImageFormat('jpeg'); /* set preview format to jpeg */
header('Content-Type: image/jpeg'); /* display preview */
echo $preview;
?>

In my everyday work I’m using Portable Firefox which I’m carrying around on my usb stick. Nice thing with Firefox is that it allows you to have multiple profiles. I have regular Firefox installed on my machine and I’m using it for regular browsing (so I don’t need web developing extensions). Problem was that I couldn’t run Firefox Portable and regular Firefox at the same time. But I found solution and here it is. All you have to do is:

1. Find a file named FirefoxPortable.ini (located in FirefoxPortable\Other\Source)
2. Copy that file to your FirefoxPortable folder (one that has FirefoxPortable.exe in it)
3. Edit that FirefoxPortable.ini file, change AllowMultipleInstances to true

and that’s it. You can now run multiple instances of Firefox (either Portable or regular one)

Do you want to detect if somebody pressed enter on your form (maybe to prevent form submitting when someone press enter key). Here is jquery code that can help you to detect enter key being pressed:

$('input').keyup(function(e) {
	if(e.keyCode == 13) {
		alert('Enter key was pressed.');
	}
});

If you want to disable Enter key submitting youw form you can use something like this:

$("form").bind("keypress", function(e) {
	if (e.keyCode == 13) return false;
});

I am totally against any CSS hacks, but sometimes if you need quick result, and you need everything to work and look exactly the same in both Firefox and IE you just have to use them. Here is simple CSS hack that you can use to apply different styles depending on browser your visitor is using.

div.test {
	background:blue;	/* Firefox, Opera */
	#background:green;	/* IE7 */
	_background:red;	/* IE6 */
}

First background style is compatible with all browsers (and Firefox and Opera will use this one, and stop there)
Second one (#background) will be ignored by Firefox, and you will see it in IE7, but IE7 will ignore
Third one (_background) and you will see this one just in IE6…

See this demo:
Demo
What color is a background on your screen?
css-different-browsers-different-styles

I just spent few hours trying to make Flash Player to stream FLV files (Flash videos). Everything worked on testing server but not on the other one. As you may guess, the other server was Microsoft IIS, and SWF files were playing ok, but not FLV. Problem is that Microsoft IIS 6.0 requires a MIME type to recognize that FLV files are streamed media. And all you have to do to fix that is to add new MIME Type:

Associated Extension: .FLV
MIME Type:flv-application/octet-stream

And that’s it. Everything is working now.