function resizeContentBlock(targetID, sourceIDs) {
	var targetBlock = document.getElementById(targetID);
	var sourceHeight = 0;
	for (var i=0; i<sourceIDs.length; i++) {
		var sourceBlock = document.getElementById(sourceIDs[i]);
		if (!isNull(sourceBlock)) {
			sourceHeight = (sourceBlock.offsetHeight > sourceHeight) ? sourceBlock.offsetHeight : sourceHeight;
		}
	}
	targetBlock.style.height = sourceHeight + 190;
}

function addID(myArray, sourceID) {
	myArray[myArray.length] = sourceID;
}

function isNull(a) {
    return typeof a == 'object' && !a;
}