var className = 'external';
var as = document.getElementsByTagName('a');
for(i=0;i<as.length;i++)
{
	var a = as[i];
	r=new RegExp("(^| )"+className+"($| )");
	if(r.test(a.className))
	{
		a.onclick = function(){window.open(this.href);return false;}
	}
}