function externalLinks() {
 if (!document.getElementsByTagName) return;
 var anchors = document.getElementsByTagName("a");
 for (var i=0; i<anchors.length; i++) {
   var anchor = anchors[i];
   if (anchor.getAttribute("href") && anchor.getAttribute("rel") == "external")
     anchor.target = "_blank";
 }
}
externalLinks(); window.onload = externalLinks;

//Clear input text on click
//credits: http://www.scriptygoddess.com/archives/2005/11/15/clear-default-text-onclick-restore-if-nothing-entered/
function clickclear(thisfield, defaulttext) {
	if (thisfield.value == defaulttext) {
		thisfield.value = "";
	}
}
function clickrecall(thisfield, defaulttext) {
	if (thisfield.value == "") {
		thisfield.value = defaulttext;
	}
}
//usage: <input type="text" name="myfield" onclick="clickclear(this, 'default text')" onblur="clickrecall(this,'default text')" />