/*******************************************************************
* File    : JSFX_SimpleRollover.js © JavaScript-FX.com
* 
* Created : 2001/03/19 
* 
* Author  : Roy Whittle www.Roy.Whittle.com 
* 
* Purpose : To create image rollovers.
*               For simple image swaps this code is a little too heavy. 
*               However, if you have pre image loads and multiple image
*               swaps then this can work out better by allowing the 
*               page to load faster.
*               The best feature is the "post" image load.
*
* History 
* Date         Version        Description 
* 
* 2001-03-18    1.0             Initial version for JavaScript-FX.com
* 2001-09-17    1.1             Made the interface the same as for animated 
*                                       and fading rollovers.
***********************************************************************/ 
if(!window.JSFX)
        JSFX=new Object();

JSFX.RolloverObjects=new Array();

JSFX.Rollover = function(name, img)
{
        JSFX.RolloverObjects[name]= new Image();
        JSFX.RolloverObjects[name].img_src = img;       
        if(!JSFX.Rollover.postLoad)
                JSFX.RolloverObjects[name].src = img;
}
JSFX.Rollover.postLoad = true;
JSFX.Rollover.loadImages = function()
{
        var i;
        for(i in JSFX.RolloverObjects)
        {
                r=JSFX.RolloverObjects[i];
                r.src=r.img_src;
        }
}
JSFX.Rollover.error = function(n)
{
                alert("JSFX.Rollover - An Error has been detected\n"
                        + "----------------------------------\n"
                        + "You must define a JSFX.Rollover in your document\n"
                        + "JSFX.Rollover(\""+n+"\",\"your_on_img.gif\")\n"
                        + "(check the spelling of your JSFX.Rollovers)");
}
JSFX.findImg = function(n) 
{
        var img = JSFX.getImg(n, document);

        /*** Stop emails because the image was named incorrectly ***/
        if(!img)
        {
                alert("JSFX.Rollover - An Error has been detected\n"
                        + "----------------------------------\n"
                        + "You must define an image in your document\n"
                        + "<IMG SRC=\"your_image.ext\" NAME=\""+n+"\">\n"
                        + "(check the NAME= attribute of your images)");

                return(new Image());
        }
        return img;
}
JSFX.getImg = function(n, d)
{
        var img = d.images[n];

        if(!img && d.layers)
                for(var i=0 ; !img && i<d.layers.length ; i++)
                        img=JSFX.getImg(n,d.layers[i].document);

        return img;
}
JSFX.imgOn = function(imgName, rollName)
{
        if(rollName == null)
                rollName=imgName;

        /*** Stop emails because the rollover was named incorrectly ***/
        if(!JSFX.RolloverObjects[rollName])
        {
                JSFX.Rollover.error(rollName);
                return;
        }
        var img = JSFX.findImg(imgName);
        if(img.offSrc==null)
                img.offSrc=img.src;
        img.src=JSFX.RolloverObjects[rollName].img_src;
}
JSFX.imgOff = function(imgName)
{
        var img = JSFX.findImg(imgName);
        img.src=img.offSrc;
}