It's been a little while since I did any jquery and for some reason I am stuck on my second line of code.

var $pheight = $(window).height();

$('#col_left').css('height', $pheight);

All I need to do is take the height of the window and resize #col_left to that value.
Simple right? I can't seem to see anything wrong with it. I do have jquery installed on the site so that is not the problem. I also have tested the variable with an alert and am getting the correct value. What is wrong here?

Thanks all