<!-- ---------------------------------------------------- -->
<!-- Menu Bar Demo                                        -->
<!--                                                      -->
<!-- Copyright 2000 by Mike Hall                          -->
<!-- Please see http://www.brainjar.com for terms of use. -->
<!-- ---------------------------------------------------- -->
// Determine browser and version. Script works for IE 5.5+ and NS 6.0+

function Browser() {

  var ua, s, i;

  this.isIE    = false;  // Internet Explorer
  this.isNS    = false;  // Netscape
  this.version = null;

  ua = navigator.userAgent;

  s = "MSIE";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isIE = true;
    this.version = parseFloat(ua.substr(i + s.length));
    return;
  }

  s = "Netscape6/";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isNS = true;
    this.version = parseFloat(ua.substr(i + s.length));
    return;
  }
}

var browser = new Browser();

// For IE, adjust menu bar styling.

if (browser.isIE) {
  document.styleSheets[document.styleSheets.length - 1].addRule("#menuBar", "padding-top:2px");
  document.styleSheets[document.styleSheets.length - 1].addRule("#menuBar", "padding-bottom:3px");
}

// Global variable for tracking the currently active button.

var activeButton = null;

// Capture mouse clicks on the page so any active button can be
// deactivated.

if (browser.isIE)
  document.onmousedown = pageMousedown;
if (browser.isNS)
  document.addEventListener("mousedown", pageMousedown, true);

function pageMousedown(event) {

  var className;

  // If the object clicked on was not a menu button or item, close any
  // active menu.

  if (browser.isIE)
    className = window.event.srcElement.className;
  if (browser.isNS)
    className = (event.target.className ?
      event.target.className : event.target.parentNode.className);

  if (className != "menuButton"  && className != "menuItem" &&
      className != "menuItemSep" && activeButton)
    resetButton(activeButton);
}

function buttonClick(button, menuName) {

  // Blur focus from the link to remove that annoying outline.

  button.blur();

  // Associate the named menu to this button if not already done.

  if (!button.menu)
    button.menu = document.getElementById(menuName);

  // Reset the currently active button, if any.

  if (activeButton && activeButton != button)
    resetButton(activeButton);

  // Toggle the button's state.

  if (button.isDepressed)
    resetButton(button);
  else
    depressButton(button);

  return false;
}

function nullButtonClick(button) {
  button.blur();
}

function buttonMouseover(button, menuName) {

  // If any other button menu is active, deactivate it and activate this one.
  // Note: if this button has no menu, leave the active menu alone.

  if (activeButton && activeButton != button) {
    resetButton(activeButton);
    if (menuName)
      buttonClick(button, menuName);
  }
}

function depressButton(button) {

  var w, dw, x, y;

  // Change the button's style class to make it look like it's depressed.

  button.className = "menuButtonActive";

  // For IE, set an explicit width on the first menu item. This will
  // cause link hovers to work on all the menu's items even when the
  // cursor is not over the link's text.

  if (browser.isIE && !button.menu.firstChild.style.width) {
    w = button.menu.firstChild.offsetWidth;
    button.menu.firstChild.style.width = w + "px";
    dw = button.menu.firstChild.offsetWidth - w;
    w -= dw;
    button.menu.firstChild.style.width = w + "px";
  }

  // Position the associated drop down menu under the button and
  // show it. Note that the position must be adjusted according to
  // browser, styling and positioning.

  x = getPageOffsetLeft(button);
  y = getPageOffsetTop(button) + button.offsetHeight;
  if (browser.isIE || (browser.isNS && browser.version >= 6.1))
    y += 2;
  if (browser.isNS && browser.version < 6.1) {
    x--;
    y--;
  }
  button.menu.style.left = x + "px";
  button.menu.style.top  = y + "px";
  button.menu.style.visibility = "visible";

  // Set button state and let the world know which button is
  // active.

  button.isDepressed = true;
  activeButton = button;
}

function resetButton(button) {

  // Restore the button's style class.

  button.className = "menuButton";

  // Hide the button's menu.

  if (button.menu)
    button.menu.style.visibility = "hidden";

  // Set button state and clear active menu global.

  button.isDepressed = false;
  activeButton = null;
}

function getPageOffsetLeft(el) {

  // Return the true x coordinate of an element relative to the page.

  return el.offsetLeft + (el.offsetParent ? getPageOffsetLeft(el.offsetParent) : 0);
}

function getPageOffsetTop(el) {

  // Return the true y coordinate of an element relative to the page.

  return el.offsetTop + (el.offsetParent ? getPageOffsetTop(el.offsetParent) : 0);
}

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;

function preloadImages() {
	if (document.images) {
		search1 = newImage("/images/search1.gif");
		physicians1 = newImage("/images/physicians1.gif");
		home1 = newImage("/images/home1.gif");
		healthlinks1 = newImage("/images/healthlinks1.gif");
		
		preloadFlag = true;
	}
}