/********************************************************************************

FILE:                   imageshandling.js

PURPOSE:                General mouseover, mouseclick functions

WHAT IT CONTAINS:       Functions for general imagehandling, including mouseover

						mouseout and click states. Also handles preloading.

AUTHOR:					CJ de Vos.

********************************************************************************/





/********************************************************************************

function       : imageAction(imgname, normal, mo, active)

parameters     : imgname - name of the image as found in the image tag (input, string)

				 normal - source of the normalstate image (input, string)

				 mo - source of the mouseover image (input, string)

				 active - source of the clicked state image (input, string)

Date added     : 10 Feb 2001

Changed        : 19 Feb 2002 by Max Davidse (added comments)

Functionality  : Holds all imagenames and sources used for preloading.

Author         : CJ de Vos

Still Needs    : -

********************************************************************************/

function imageAction(imgname, normal, mo, active)

{

    this.name=imgname

    this.normalimg = new Image();

    this.normalimg.src = normal;

    this.mouseoverimg = new Image();

    this.mouseoverimg.src = mo;

    this.activeimg = new Image();

    this.activeimg.src = active;

}



/********************************************************************************

function       : iSwap(imgname, state)

parameters     : imgname - name of the image as found in the image tag (input, string)

				 state - either 1 or 0, to turn the image on or off (input, integer)

Date added     : 10 Feb 2001

Changed        : 19 Feb 2002 by Max Davidse (added comments)

Functionality  : Swaps the image to on or off, depending on the state parameter.

Author         : CJ de Vos

Still Needs    : -

********************************************************************************/

function iSwap(imgname, state)

{

    iObj = GetImage(imgname);

    if(!iObj) return;

    if(document.imageCurrent && iObj==document.imageCurrent) return;

    if(document.imagesarray)

    {

      for(i=0;i<document.imagesarray.length;i++)

      if(document.imagesarray[i].name==imgname)

        iObj.src = eval("document.imagesarray[i]."+((state==1)?"mouseoverimg":"normalimg")+".src");

    }    

}



/********************************************************************************

function       : iClick(imgname)

parameters     : imgname - name of the image as found in the image tag (input, string)

Date added     : 10 Feb 2001

Changed        : 19 Feb 2002 by Max Davidse (added comments)

Functionality  : Swaps the image to it's clicked state.

Author         : CJ de Vos

Still Needs    : -

********************************************************************************/

function iClick(imgname)

{

    iObj = GetImage(imgname)

    if(!iObj) return;

    if(document.imageCurrent && iObj==document.imageCurrent) return;

    if(document.imageCurrent && document.imageNormal)

        document.imageCurrent.src = document.imageNormal.src;

    for(i=0;i<document.imagesarray.length;i++)

    {

        if(document.imagesarray[i].name==imgname)

        {

            iObj.src = document.imagesarray[i].activeimg.src;

            document.imageCurrent = iObj;

            document.imageNormal = document.imagesarray[i].normalimg;

        }

    }

}



/********************************************************************************

function       : iPreload(imgname, normalimg, mouseoverimg, activeimg)

parameters     : imgname - name of the image as found in the image tag (input, string)

				 normalimg - source of the normalstate image (input, string)

				 mouseoverimg - source of the mouseover image (input, string)

				 activeimg - source of the clicked image (input, string)

Date added     : 10 Feb 2001

Changed        : 19 Feb 2002 by Max Davidse (added comments)

Functionality  : Preloads all used images.

Author         : CJ de Vos

Still Needs    : -

********************************************************************************/

function iPreload(imgname, normalimg, mouseoverimg, activeimg)

{

    // Check if array already exists, if not, create it

    if(!document.imagesarray) document.imagesarray = new Array();



    // Array should've been created now, let's continue.

    szImgname   = imgname.split("|");

    szNormal    = normalimg.split("|");

    szMouseover = mouseoverimg.split("|");

    szActive    = activeimg.split("|");

    for(var i=0;i<szNormal.length;i++)

        document.imagesarray[document.imagesarray.length] = new imageAction(szImgname[i], szNormal[i], szMouseover[i], szActive[i]);

}



/********************************************************************************

function       : GetImage(imgname)

parameters     : imgname - name of the image as found in the image tag (input, string)

Date added     : 10 Feb 2001

Changed        : 19 Feb 2002 by Max Davidse (added comments)

Functionality  : Finds the image by calling the function FindImage.

Author         : CJ de Vos

Still Needs    : -

********************************************************************************/

function GetImage(imgname)

{

	return (document.layers)?FindImage(imgname):document.all[imgname];

}



/********************************************************************************

function       : FindImage(imgname, obj)

parameters     : imgname - name of the image as found in the image tag (input, string)

				 obj - reference to the object of the image. (input, object)

Date added     : 10 Feb 2001

Changed        : 19 Feb 2002 by Max Davidse (added comments)

Functionality  : Swaps the image to it's clicked state.

Author         : CJ de Vos

Still Needs    : -

********************************************************************************/

function FindImage(imgname, obj)

{

    var i=0;

    var perObj = null;

    var tmpObj = (obj) ? obj.document.layers : document.layers;

    for(i=0;i<tmpObj.length;i++)

    {

        str += tmpObj[i].id;

        if(tmpObj[i].document.images[imgname]) return tmpObj[i].document.images[imgname];

    if(perObj = FindImage(imgname, tmpObj[i])) return perObj;

    }

    return false;

}