/**
 * SUBMODAL v1.4
 * Used for displaying DHTML only popups instead of using buggy modal windows.
 *
 * By Seth Banks (webmaster at subimage dot com)
 * http://www.subimage.com/
 *
 * Contributions by:
 *  Eric Angel - tab index code
 *  Scott - hiding/showing selects for IE users
 * Todd Huss - inserting modal dynamically and anchor classes
 *
 * Up to date code can be found at http://www.subimage.com/dhtml/subModal
 * 
 *
 * This code is free for you to use anywhere, just keep this comment block.
 */

// Popup code
var gPopupMask = null;
var gPopupContainer = null;
var gPopFrame = null;
var gReturnFunc;
var gPopupIsShown = false;

var gHideSelects = false;

var yPos=0;

var gTabIndexes = new Array();
// Pre-defined list of tags we want to disable/enable tabbing into
var gTabbableTags = new Array("A","BUTTON","TEXTAREA","INPUT","IFRAME"); 

// If using Mozilla or Firefox, use Tab-key trap.
if (!document.all) {
 document.onkeypress = keyDownHandler;
}



/**
 * Initializes popup code on load. 
 */
function initPopUp() {
 // Add the HTML to the body
 
 gPopupMask = $("popupMask");
 gPopupContainer = $("popupContainer");
// gPopFrame = $("popupFrame"); 
 
 // check to see if this is IE version 6 or lower. hide select boxes if so
 // maybe they'll fix this in version 7?
 var brsVersion = parseInt(window.navigator.appVersion.charAt(0), 10);
 if (brsVersion <= 6 && window.navigator.userAgent.indexOf("MSIE") > -1) {
  gHideSelects = true;
 }
 
 // Add onclick handlers to 'a' elements of class submodal or submodal-width-height
 var elms = document.getElementsByTagName('a');
 for (i = 0; i < elms.length; i++) {
  if (elms[i].className.indexOf("submodal") == 0) { 
   // var onclick = 'function (){showPopWin(\''+elms[i].href+'\','+width+', '+height+', null);return false;};';
   // elms[i].onclick = eval(onclick);
   elms[i].onclick = function(){
    // default width and height
    var width = 467;
    var height = 326;
    // Parse out optional width and height from className
    params = this.className.split('-');
    if (params.length == 3) {
     width = parseInt(params[1]);
     height = parseInt(params[2]);
    }
    showPopWin(width,height,null); return false;
   }
  }
 }
}
addEvent(window, "load", initPopUp);

 /**
 * @argument width - int in pixels
 * @argument height - int in pixels
 * @argument url - url to display
 * @argument returnFunc - function to call when returning true from the window.
 * @argument showCloseBox - show the close box - default true
 */

function showPopWin(width, height) {
 // show or hide the window close widget
 gPopupIsShown = true;
 disableTabIndexes();
 gPopupMask.style.display = "block";
 gPopupContainer.style.display = "block";
 // calculate where to place the window on screen
 centerPopWin(width, height);
 

 gPopupContainer.style.width = width + "px";
 gPopupContainer.style.height = height + "px";
 
 setMaskSize();

 // for IE
    if (window.navigator.userAgent.indexOf("MSIE") > -1) {
  if (self.pageYOffset) {
   yPos = self.pageYOffset;
  } else if (document.documentElement && document.documentElement.scrollTop){
   yPos = document.documentElement.scrollTop; 
  } else if (document.body) {
   yPos = document.body.scrollTop;
  }
    }
    
 if (gHideSelects == true) {
  hideSelectBoxes();
 }

 // for IE
    if (window.navigator.userAgent.indexOf("MSIE") > -1) {
        window.scrollTo(0, 0);
    }
    
    return false;
}

//
var gi = 0;
function centerPopWin(width, height) {
 if (gPopupIsShown == true) {
  if (width == null || isNaN(width)) {
   width = gPopupContainer.offsetWidth;
  }
  if (height == null) {
   height = gPopupContainer.offsetHeight;
  }
  
  //var theBody = document.documentElement;
  var theBody = document.getElementsByTagName("BODY")[0];
  theBody.style.overflow = "hidden";
  
  var scTop = parseInt(theBody.scrollTop,10);
  var scLeft = parseInt(theBody.scrollLeft,10);
  
  gPopupMask.style.top = scTop + "px";
  gPopupMask.style.left = scLeft + "px";
 
  setMaskSize();
  
  //window.status = gPopupMask.style.top + " " + gPopupMask.style.left + " " + gi++;
  
 
  var fullHeight = getViewportHeight();
  var fullWidth = getViewportWidth();
  
        if (scTop + ((fullHeight - height) / 2)<0) gPopupContainer.style.top ="0px";
        else gPopupContainer.style.top = (scTop + ((fullHeight - height) / 2)) + "px";
  gPopupContainer.style.left =  (scLeft + ((fullWidth - width) / 2)) + "px";
  //alert(fullWidth + " " + width + " " + gPopupContainer.style.left);
 }
}
addEvent(window, "resize", centerPopWin);
//addEvent(window, "scroll", centerPopWin);
window.onscroll = centerPopWin;

/**
 * Sets the size of the popup mask.
 *
 */
function setMaskSize() {
 var theBody = document.getElementsByTagName("BODY")[0];
   
 var fullHeight = getViewportHeight();
 var fullWidth = getViewportWidth();
 
 // Determine what's bigger, scrollHeight or fullHeight / width
 if (fullHeight > theBody.scrollHeight) {
  popHeight = fullHeight;
 } else {
  popHeight = theBody.scrollHeight;
 }
 
 if (fullWidth > theBody.scrollWidth) {
  popWidth = fullWidth;
 } else {
  popWidth = theBody.scrollWidth;
 }
 
 gPopupMask.style.height = popHeight + "px";
 gPopupMask.style.width = popWidth + "px";
}

/**
 * @argument callReturnFunc - bool - determines if we call the return function specified
 * @argument returnVal - anything - return value 
 */
function hidePopWin(callReturnFunc) {
 gPopupIsShown = false;
 var theBody = document.getElementsByTagName("BODY")[0];
 theBody.style.overflow = "";
 restoreTabIndexes();
 if (gPopupMask == null) {
  return;
 }
 gPopupMask.style.display = "none";
 gPopupContainer.style.display = "none";
 // for IE
    if (window.navigator.userAgent.indexOf("MSIE") > -1) {
        window.scrollTo(0, yPos);
    }
 // display all select boxes
 if (gHideSelects == true) {
  displaySelectBoxes();
 }
}

// Tab key trap. iff popup is shown and key was [TAB], suppress it.
// @argument e - event - keyboard event that caused this function to be called.
function keyDownHandler(e) {
    if (gPopupIsShown && e.keyCode == 9)  return false;
}

// For IE.  Go through predefined tags and disable tabbing into them.
function disableTabIndexes() {
 if (document.all) {
  var i = 0;
  for (var j = 0; j < gTabbableTags.length; j++) {
   var tagElements = document.getElementsByTagName(gTabbableTags[j]);
   for (var k = 0 ; k < tagElements.length; k++) {
    gTabIndexes[i] = tagElements[k].tabIndex;
    tagElements[k].tabIndex="-1";
    i++;
   }
  }
 }
}

// For IE. Restore tab-indexes.
function restoreTabIndexes() {
 if (document.all) {
  var i = 0;
  for (var j = 0; j < gTabbableTags.length; j++) {
   var tagElements = document.getElementsByTagName(gTabbableTags[j]);
   for (var k = 0 ; k < tagElements.length; k++) {
    tagElements[k].tabIndex = gTabIndexes[i];
    tagElements[k].tabEnabled = true;
    i++;
   }
  }
 }
}


/**
* Hides all drop down form select boxes on the screen so they do not appear above the mask layer.
* IE has a problem with wanted select form tags to always be the topmost z-index or layer
*
* Thanks for the code Scott!
*/
function hideSelectBoxes() {
    var selElements=document.getElementsByTagName("SELECT");
 for (var i = 0; i < selElements.length; i++) selElements[i].style.visibility="hidden";
}

/**
* Makes all drop down form select boxes on the screen visible so they do not reappear after the dialog is closed.
* IE has a problem with wanted select form tags to always be the topmost z-index or layer
*/
function displaySelectBoxes() {
    var selElements=document.getElementsByTagName("SELECT");
 for (var i = 0; i < selElements.length; i++) selElements[i].style.visibility="visible";
}