$(document).ready(function() {
   // Pass in the number of buttons to be displayed on the screen at the same time
	adjustNavButtons(3);
});

function adjustNavButtons(numPerScreen){
	numButtons = $("#navContainer").children().length;
	buttonsArray = $("#navContainer").children();
	viewportHeight = document.getElementById("nav").offsetHeight;
	spaceHeight = (viewportHeight - (numPerScreen * 96)) / (numPerScreen - 1);
	for (i=0; i<=numButtons-1; i++){
		btnId = "#" + buttonsArray[i].id;
		btnTop = i * (spaceHeight + 96);
		$(btnId).css({"top":btnTop});
	};
	contHeight = numButtons * (spaceHeight + 96);
	$("#navContainer").css({"height":contHeight});
};

<!--
function MM_goToURL() { //v3.0
  var i, args=MM_goToURL.arguments; document.MM_returnValue = false;
  for (i=0; i<(args.length-1); i+=2) eval(args[i]+".location='"+args[i+1]+"'");
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}
//-->