Spawning from Specific Dropdown Values

I am currently trying to spawn one template from specific values from a dropdown. Currently, my code is spawning a template from all values. Help!

var t = this.getField("Dropdown").value;

var templateName = "";
switch (sel) {
case "0": templateName = "";
break;
case "1": templateName = "";
break;
case "2": templateName = "Related Parties";
break;
case "3": templateName = "Related Parties";
break;
case "4": templateName = "Related Parties";
break;
}

if (templateName != "") {
var t = this.getTemplate("templateName");
t.spawn({nPage:this.pageNum+1,bOverlay:false});
}