What's the css for setting a form select element's width and horizontal position? 
Should width be treated instead with an html attribute? 

I know about left and right margin for setting horizontal position, but the validation messages from my javascript are being messed up when using 

    margenleft{
                 margin-left:120px;
            }

on a different resolution, how can I do this relatively? I want the select elements to be centrally placed.
What's the css for setting a form select element's width and horizontal position? 
===

Should width be treated instead with an html attribute? 

I know about left and right margin for setting horizontal position, but the validation messages from my javascript are being messed up when using 

    margenleft{
                 margin-left:120px;
            }

on a different resolution, how can I do this relatively? I want the select elements to be centrally placed.