function load_script(src, type) {
	var document_scripts = document.getElementsByTagName(type == 'js' ? "script" : "link");
	for (document_scripts_index = 0; document_scripts_index < document_scripts.length; ++document_scripts_index) {
	  var document_script = document_scripts[document_scripts_index];
	  if (document_script.src) {
	  	var test = document_script.src;
	  	if ((test.match(src+"$")==src) || (src.match(test.src+"$")==test)) return false;
	  }
	}
	var script;
	if (type=='js') {
		script = document.createElement('script');
		script.type = 'text/javascript';
		script.src = src;
	} else {
		script = document.createElement('link');
		script.type = 'text/css';
		script.rel = 'stylesheet';
		script.href = src;
	}
	document.getElementsByTagName('head')[0].appendChild(script);
}