var adLoc;
var adSize;
var swcAD = "ctag3";

switch(swcAD)
{
case "rtag1":
  {
	adLoc="RESCUE_728_1";
	adSize="728x90"
  break;
	}
case "rtag2":
  {
	adLoc="RESCUE_728_2";
	adSize="728x90"
  break;
	}
case "rtag3":
  {
	adLoc="RESCUE_728_3";
	adSize="728x90"
  break;
	}
case "rtag4":
  {
	adLoc="RESCUE_120_1";
	adSize="120x600"
  break;
	}
case "rtag5":
  {
	adLoc="RESCUE_120_2";
	adSize="120x600"
  break;
	}
case "tag6":
  {
	adLoc="RESCUE_120_3";
	adSize="120x600"
  break;
	}
case "rtag7":
  {
	adLoc="RESCUE";
	adSize="180x150"
  break;
	}
case "rtag8":
  {
	adLoc="RESCUE";
	adSize="120x60"
  break;
	}
case "ctag1":
  {
	adLoc="COURSE_728_1";
	adSize="728x90"
  break;
	}
case "ctag2":
  {
	adLoc="COURSE_728_2";
	adSize="728x90"
  break;
	}
case "ctag3":
  {
	adLoc="COURSE";
	adSize="120x600"
  break;
	}
case "ctag4":
  {
	adLoc="COURSE_180_1";
	adSize="180x150"
  break;
	}
case "ctag5":
  {
	adLoc="COURSE_180_2";
	adSize="180x150"
  break;
	}
case "cmtag1":
  {
	adLoc="COMMUNITY";
	adSize="728x90"
  break;
	}
case "cmtag2":
  {
	adLoc="COMMUNITY";
	adSize="120x600"
  break;
	}
case "cmtag3":
  {
	adLoc="COMMUNITY";
	adSize="180x150"
  break;
	}
case "cmtag4":
  {
	adLoc="COMMUNITY";
	adSize="120x60"
  break;
	}	
case "badge1":
  {
	adLoc="CON_COMMBR";
	adSize="120x60"
  break;
	}	
case "badge2":
  {
	adLoc="CON_COURMBR";
	adSize="120x60"
  break;
	}	
case "badge3":
  {
	adLoc="CON_COURGRAD";
	adSize="120x60"
  break;
	}	
default:
  
  break;
	
}
<!-- Hide from old browsers
// Modify to reflect site specifics
adserver = "http://imgw.adbureau.net";
target = "/SITE=SESSIONSWITHCESAR.COM/AREA="+ adLoc + "/AAMSZ=" + adSize;
// Cache-busting and pageid values
random = Math.round(Math.random() * 100000000);
if (!pageNum) var pageNum = Math.round(Math.random() * 100000000);
document.write('<SCR');
document.write('IPT SRC="' + adserver + '/jserver/acc_random=' + random + target + "/pageid=" + pageNum + '">');
document.write('</SCR');
document.write('IPT>');
// End Hide -->