Set absolute position for client control

I'm trying to set position for an image control. Not sure if I'm doing it right. Seems like that when I change value of Left and Right, the image always appears top left hand regradless.

<img alt="No Image" src="icons/Vecenergy_RGB_1800p.jpg" name="slide" width="160"
         height="70" style="position: absolute; left:100; top:50;">

PHP:

 

Guess I could use:

style="position: absolute; left:100px; top:50px;