var Core = {};

Core.getElementsByClass = function(theClass)
{
  var elementArray = [];

  if (document.all)
  {
    elementArray = document.all;
  }
  else
  {
    elementArray = document.getElementsByTagName("*");
  }

  var matchedArray = [];
  var pattern = new RegExp("(^| )" + theClass + "( |$)");

  for (var i = 0; i < elementArray.length; i++)
  {
    if (pattern.test(elementArray[i].className))
    {
      matchedArray[matchedArray.length] = elementArray[i];
    }
  }

  return matchedArray;
};

function hideClass(classObj) {
	var list = Core.getElementsByClass(classObj);
	for (var i = 0; i < list.length; i++) {
	list[i].style.display = 'none';
	}
}

function showDiv(divObj) {
	document.getElementById(divObj).style.display='block';
}

function hideDiv(divObj) {
	document.getElementById(divObj).style.display='none';
}

function clearImgs() {
	document.images["mainnav_why"].src = "images/mainnav_why_off.gif";
	document.images["mainnav_apply"].src = "images/mainnav_apply_off.gif";
	document.images["mainnav_accepted"].src = "images/mainnav_accepted_off.gif";
	document.images["mainnav_academics"].src = "images/mainnav_academics_off.gif";
	document.images["mainnav_student"].src = "images/mainnav_student_off.gif";
}


if (document.images) {

mainnav_why=new Image
mainnav_why.src="images/mainnav_why_off.gif"
mainnav_why_hot=new Image
mainnav_why_hot.src="images/mainnav_why_on.gif"

mainnav_apply=new Image
mainnav_apply.src="images/mainnav_apply_off.gif"
mainnav_apply_hot=new Image
mainnav_apply_hot.src="images/mainnav_apply_on.gif"

mainnav_accepted=new Image
mainnav_accepted.src="images/mainnav_accepted_off.gif"
mainnav_accepted_hot=new Image
mainnav_accepted_hot.src="images/mainnav_accepted_on.gif"

mainnav_academics=new Image
mainnav_academics.src="images/mainnav_academics_off.gif"
mainnav_academics_hot=new Image
mainnav_academics_hot.src="images/mainnav_academics_on.gif"

mainnav_student=new Image
mainnav_student.src="images/mainnav_student_off.gif"
mainnav_student_hot=new Image
mainnav_student_hot.src="images/mainnav_student_on.gif"

}

function rollover(imgDocID,imgObjName,mainImgLeft,mainImgRight) {
        if (document.images) {
        document.images[imgDocID].src = eval(imgObjName + ".src");
		}
}