Workaround for pop-up windows under js_javascript skills

So the code used is:
onChange="window.open(this.options[this.selectedIndex].value,'_blank')"
But this can be easily blocked... There is a better way Can
use a workaround?
1. Use for the page
2.document.getElementById('aa').href=this.options[this.selectedIndex].value;
3.Execute document.getElementById('aa').click