function a_set_target () {
if(!document.getElementsByTagName) return;
	var a_all = document.getElementsByTagName("a");
	for(var l=0; l<a_all.length; l++) {
		var a_current = a_all[l];
		if(a_current.getAttribute("href") && a_current.getAttribute("rel") == "a_target") a_current.target = "_blank";
	}
}
window.onload = a_set_target;