how to use variables while using css classes?

how to use variables while using css classes?

I want to use variable names while accessing css classes.
Here  I am giving example about my query

 function ab(temp){
     var spc = "horizontal"+temp;
     $("#spc .cssClass").css("left","20px");
 }



 
variable temp will change dynamically. as per temp we need to acces horzontal1 or horizontal2  divs.
im new to jquery.  please suggest me