Why does the switch below give me an "unexpected '>'" error? I Google'd for examples and found some that write it case > $numeral and others that write it case > = $numeral, but both give me the same error.

I want to display a centered image ($Img1C) if that image is more than 250 pixels wide, with the default image size floated to the right ($Img1R).


PHP Code:
 case > 
$Img1st $Img1C;
$Img1st $Img1R;