This function returns the overall height of the Profound UI runtime container based on the absolute position and height of the elements within it.  It is useful in dynamically positioning a footer specified in start.html.

Example:

var footer = getObj("myfooter");  // get a reference to the footer div
var footerTop = pui.getRuntimeContainerHeight() + 20;  // calculate footer top position based on runtime container height
footer.style.top = footerTop + "px";  // assign the new top position