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"; 
		}
	}
} 

window.onload = externalLinks;

function fixColumns(){
  var h1 = document.getElementById("subject1").offsetHeight;
  var h2 = document.getElementById("subject2").offsetHeight;
  var h3 = document.getElementById("subject3").offsetHeight;
  var max = h1;
  if(h2 > max) max = h2;
  if(h3 > max) max = h3;
  document.getElementById("subject1").style.height = max + "px";
  document.getElementById("subject2").style.height = max + "px";
  document.getElementById("subject3").style.height = max + "px";
}
fixColumns();


window.onresize=fixColumns;