// function to obtain the height of the client window.

function getWindowHeight() {
	var windowHeight = 0;
	if (typeof(window.innerHeight) == 'number') {
		windowHeight = window.innerHeight;
	} else {
		if (document.documentElement && document.documentElement.clientHeight) {
			windowHeight = document.documentElement.clientHeight;
		} else {
			if (document.body && document.body.clientHeight) {
				windowHeight = document.body.clientHeight;
			}
		}
	}
	return windowHeight;
}

function targetLinks() {
	var lnks = document.getElementsByTagName('a');
    for (var i = 0; i < lnks.length; i++) {
		var lnk = lnks[i];
		if (lnk.getAttribute("href") && lnk.getAttribute("rel") == "external") lnk.target = "_blank"; 
   	}
}