Well I have been working with the language so long that I can basically write it all up in Notepad and know what it is going to look like. Dreamweaver [which I hate] offers a split view where you can code and it will show what is happening below. Then there is the way my friend danny does it, open a text editor and make it so that it takes up half the screen, open the page in IE and make it so that it takes up the other half, save the code and refresh the IE window anytime you want to see what is going on.

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"Your sig... flashes... too much O_o..."
"Sometimes, girls need to be told to be to keep in place. So whenever your arm candy starts to speak without being spoken to, I'd suggest you smack her, and/or verbally abuse her. It's the way Jesus would do things. And I follow Jesus. So, don't be sacreligious, and be sure to hit them whenever you see necessary."