Open link in new window with pure javascript

openlinkinewwindow.js

	<script type="text/javascript">
		window.onload = function(){
		  var anchors = document.getElementById('main_tab_sponsor').getElementsByTagName('a');
		  for (var i=0; i<anchors.length; i++){
		    anchors[i].setAttribute('target', '_blank');
			anchors[i].setAttribute('href', "http://www.myurl.com")
		  }
		}
	</script>