jQuery min-width vs width: How to remove px?

Trying some basic jQuery and JavaScript here.

The .width() gives me an integer value. The .css('min-width') gives me a value ending in px. Therefore I can't do math on this as is. What is the recommended work around?

alert($('#<%=lstProcessName.ClientID%>').parent('.column4').width());
alert($('#<%=lstProcessName.ClientID%>').parent('.column4').css('min-width'));
alert($('#<%=lstProcessName.ClientID%>').parent('.column4').width() >= $('#<%=lstProcessName.ClientID%>').parent('.column4').css('min-width'));

if ($('#<%=lstProcessName.ClientID%>').parent('.column4').width() >= $('#<%=lstProcessName.ClientID%>').parent('.column4').css('min-width')) {
  ...
}