function getStyleObject(objectId) {
  if(document.getElementById && document.getElementById(objectId)) {
     return document.getElementById(objectId).style;
  } else if (document.all && document.all(objectId)) {
     return document.all(objectId).style;
  } else if (document.layers && document.layers[objectId]) {
      return getObjNN4(document,objectId);
  } else {
      return false;
  }
}

function changeObjectVisibility(objectId, newVisibility) {
  var styleObject = getStyleObject(objectId, document);
  if(styleObject) {
    styleObject.visibility = newVisibility;
    return true;
  } 
  else {
    return false;
  }
}

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 getImage(name) {
  if (document.layers) {
    return findImage(name, document);
  }
  
  return null;
}


function getObjNN4(obj,name)
{
  var x = obj.layers;
  var foundLayer;
  for (var i=0;i<x.length;i++) {
    if (x[i].id == name)
 	foundLayer = x[i];
    else if (x[i].layers.length)
	var tmp = getObjNN4(x[i],name);
    if (tmp) foundLayer = tmp;
  }
  
  return foundLayer;
}

function getElementHeight(Elem) {
  if (ns4) {
    var elem = getObjNN4(document, Elem);
    return elem.clip.height;
  }
  else {
    if(document.getElementById) {
      var elem = document.getElementById(Elem);
    } 
    else if (document.all) {
      var elem = document.all[Elem];
    }
    if (op5) { 
      xPos = elem.style.pixelHeight;
    }
    else {
      xPos = elem.offsetHeight;
    }

    return xPos;
  } 
}

function getElementWidth(Elem) {
  if (ns4) {
    var elem = getObjNN4(document, Elem);
    return elem.clip.width;
  }
  else {
    if(document.getElementById) {
      var elem = document.getElementById(Elem);
    }
    else if (document.all){
      var elem = document.all[Elem];
    }
    if (op5) {
      xPos = elem.style.pixelWidth;
    }
    else {
      xPos = elem.offsetWidth;
    }

    return xPos;
 }
}

function getElementLeft(Elem) {
  if (ns4) {
  var elem = getObjNN4(document, Elem);
    return elem.pageX;
  }
  else {
    var elem;
    if(document.getElementById) {
      var elem = document.getElementById(Elem);
    }
    else if (document.all){
      var elem = document.all[Elem];
    }

    xPos = elem.offsetLeft;
    tempEl = elem.offsetParent;
    while (tempEl != null) {
      xPos += tempEl.offsetLeft;
      tempEl = tempEl.offsetParent;
    }

    return xPos;
  }
}


function getElementTop(Elem) {
  if (ns4) {
    var elem = getObjNN4(document, Elem);
    return elem.pageY;
   }
   else {
     if(document.getElementById) {	
       var elem = document.getElementById(Elem);
     }
     else if (document.all) {
       var elem = document.all[Elem];
     }
     yPos = elem.offsetTop;
     tempEl = elem.offsetParent;
     while (tempEl != null) {
  	yPos += tempEl.offsetTop;
	tempEl = tempEl.offsetParent;
     }
    
    return yPos;
  }
}

function getImageWidth(myImage) {
  var x, obj;
  if (document.layers) {
    var img = getImage(myImage);
    return img.width;
  }
  else {
    return getElementWidth(myImage);
  }

  return -1;
}

function getImageHeight(myImage) {
  var y, obj;
  if (document.layers) {
    var img = getImage(myImage);
    return img.height;
  } 
  else {
   return getElementHeight(myImage);
  }

  return -1;
}

function getImageTop(myImage) {
  var y, obj;
  if (document.layers) {
    var img = getImage(myImage);
    if (img.container != null)
      return img.container.pageY + img.y;
    else
      return img.y;
    }
  else {
    return getElementTop(myImage);
  }

  return -1;
}


function getImageLeft(myImage) {
  var x, obj;
  if (document.layers) {
    var img = getImage(myImage);
    if (img.container != null)
      return img.container.pageX + img.x;
    else
      return img.x;
  } 
  else {
    return getElementLeft(myImage);
  }
  
  return -1;
}

function moveXY(myObject, x, y) {
  obj = getStyleObject(myObject);
  if (ns4) {
    obj.top = y;
    obj.left = x;
  }
  else {
    if (op5) {
      obj.pixelTop = y;
      obj.pixelLeft = x;
    }
    else {
      obj.top = y + 'px';
      obj.left = x + 'px';
    }	
  }
}