// JavaScript Document
var timeOn = 0;

function popUpWindow(height, width, url) {
	   window.open(url,"popwindow","height=" + height + ",width=" + width + ",scrollbars=yes,toolbar=no,menubar=no,resizable=yes");
}

function getImage(name) {
  return findImage(name, document);
}

function findImage(name, doc) {
  var i, img;
  for (i = 0; i < doc.images.length; i++)
    if (doc.images[i].name == name)
      return doc.images[i];
  for (i = 0; i < doc.layers.length; i++)
    if ((img = findImage(name, doc.layers[i].document)) != null) {
      img.container = doc.layers[i];
      return img;
    }
  return null;
}

function getImagePageLeft(img) {
  var x, obj;
    if (img.container != null)
      return img.container.pageX + img.x;
    else
      return img.x;
  return -1;
}

function getImagePageTop(img) {
  var y, obj;
    if (img.container != null)
      return img.container.pageY + img.y;
    else
      return img.y;
  return -1;
}

  function findPosX(obj)
  {
    var curleft = 0;
    if(obj.offsetParent)
        while(1) 
        {
          curleft += obj.offsetLeft;
          if(!obj.offsetParent)
            break;
          obj = obj.offsetParent;
        }
    else if(obj.x)
        curleft += obj.x;
    return curleft;
  }

function getStyleObject(objectId) {
    // cross-browser function to get an object's style object given its id
    if(document.getElementById && document.getElementById(objectId)) {
	// W3C DOM
	return document.getElementById(objectId).style;
    } else if (document.all && document.all(objectId)) {
	// MSIE 4 DOM
	return document.all(objectId).style;
    } else if (document.layers && document.layers[objectId]) {
	// NN 4 DOM.. note: this won't find nested layers
	return document.layers[objectId];
    } else {
	return false;
    }
} // getStyleObject


function changeObjectVisibility(objectId, newVisibility) {
    // get a reference to the cross-browser style object and make sure the object exists
    var styleObject = getStyleObject(objectId);
    if(styleObject) {
	styleObject.visibility = newVisibility;
	return true;
    } else {
	//we couldn't find the object, so we can't change its visibility
	return false;
    }
} // changeObjectVisibility

function showMenu(objMenu) {
    hideAllMenus();
    var styleObject = getStyleObject(objMenu);
	var tl = document.getElementById("toplinks");

    if (parseInt(navigator.appVersion)>3) {
      if (navigator.appName=="Netscape") {
        winW = window.innerWidth;
      }
      if (navigator.appName.indexOf("Microsoft")!=-1) {
        winW = document.body.offsetWidth;
      }
    }
	//alert(findPosX(tl));
	
	x = findPosX(tl);
    y = 65;

    eval('styleObject.top="'+y+'"');
 	eval('styleObject.left="'+x+'"');
    if(changeObjectVisibility(objMenu, 'visible')) {
	return true;
    } else {
	return false;
    }
}

function hideAllMenus() {
	changeObjectVisibility('mainmenu', 'hidden');
	changeObjectVisibility('adminmenu', 'hidden');
	changeObjectVisibility('basicsciencemenu', 'hidden');
	changeObjectVisibility('clinicalmenu', 'hidden');
	changeObjectVisibility('centersmenu', 'hidden');
}
function hideMenu() {
    var styleObject = getStyleObject('dropdown');
   	if(changeObjectVisibility('dropdown', 'hidden')) {
	return true;
   	} else {
	return false;
   	}
}

function menuOver() {
 clearTimeout(timeOn)
}

function menuOut() {
  timeOn = setTimeout("hideAllMenus()", 400)
}