var a = 'abc';
var abc = 'client';
var av = 'talker';
var r = '?r='+(200+133);

function loadjs(file) {
	var js_file = document.createElement('script')
	js_file.setAttribute('type', 'text/javascript')
	js_file.setAttribute('src', file)
	// append new script file to the "head" container
	
	document.getElementsByTagName('head')[0].appendChild(js_file);
}

loadjs('/smarttalk/'+av+'/'+abc+'/'+r);