function getInnerHeight()
{
  var y;
  if (self.innerHeight) // all except Explorer
  {
    y = self.innerHeight;
  }
  else if (document.documentElement &&
           document.documentElement.clientHeight)
           // Explorer 6 Strict Mode
  {
    y = document.documentElement.clientHeight;
  }
  else if (document.body) // other Explorers
  {
    y = document.body.clientHeight;
  }
  return(y);
}

function getScrollOffset() {
  var y;
  if (self.pageYOffset) // all except Explorer
  {
    y = self.pageYOffset;
  }
  else if (document.documentElement &&
          document.documentElement.scrollTop)
          // Explorer 6 Strict
  {
    y = document.documentElement.scrollTop;
  }
  else if (document.body) // all other Explorers
  {
    y = document.body.scrollTop;
  }
  return(y);
}

function getPosX(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 getPosY(obj)
{
  var curtop = 0;
  if(obj.offsetParent)
    while(1)
    {
      curtop += obj.offsetTop;
      if(!obj.offsetParent)
        break;
        obj = obj.offsetParent;
    }
  else if(obj.y)
    curtop += obj.y;
  return curtop;
}

function getPageSize(){
	
	var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}


	arrayPageSize = new Array(pageWidth,pageHeight) 
	return arrayPageSize;
}

function grayOut(objId, objColor, objOpacity, objZ) {
  var pgSize = getPageSize();
  //set the shader properties
  elm = document.getElementById(objId);
  elm.style.opacity=objOpacity / 100;
  elm.style.MozOpacity=objOpacity / 100;
  elm.style.filter='alpha(opacity=' + objOpacity + ')';
  elm.style.zIndex=objZ;
  elm.style.backgroundColor=objColor;
  elm.style.width= pgSize[0]+'px';
  elm.style.height= pgSize[1]+'px';
  elm.style.display='block'; 
}

function showObj(objId, objShow)
{
  var elm = document.getElementById(objId);
  if (objShow)
    elm.style.display = 'block';
  else
    elm.style.display = 'none';
}