/******************************************************************* 
* File    : JSFX_LinkFader.js  © JavaScript-FX.com
* Created : 2002/09/05 
* Author  : Roy Whittle  (Roy@Whittle.com) www.Roy.Whittle.com 
* Purpose : To create a more dynamic a:hover using fading
* History 
* Date         Version        Description 
* 2002-09-05    1.0     First version
***********************************************************************/
/*** Create some global variables ***/
if(!window.JSFX)JSFX=new Object();

var LinkFadeInStep=20;
var LinkFadeOutStep=5;
var LinkEndColor="00FF00"

var LinkStartColor="FFFFFF";
var LinkFadeRunning=false;

document.onmouseover = theOnOver;
document.onmouseout  = theOnOut;
if(document.captureEvents)
    document.captureEvents(Event.MOUSEOVER | Event.MOUSEOUT);

/***********************************************
*
* Function    : getColor
*
* Parameters  : start - the start color (in the form "RRGGBB" e.g. "FF00AC")
*           end - the end color (in the form "RRGGBB" e.g. "FF00AC")
*           percent - the percent (0-100) of the fade between start & end
*
* returns     : color in the form "#RRGGBB" e.g. "#FA13CE"
*
* Description : This is a utility function. Given a start and end color and
*           a percentage fade it returns a color in between the 2 colors
*
* Author      : www.JavaScript-FX.com
*
*************************************************/
function hex2dec(hex){return(parseInt(hex,16));}
function dec2hex(dec){return (dec < 16 ? "0" : "") + dec.toString(16);} 
function getColor(start, end, percent)
{

    var r1=hex2dec(start.slice(0,2));
    var g1=hex2dec(start.slice(2,4));
    var b1=hex2dec(start.slice(4,6));

    var r2=hex2dec(end.slice(0,2));
    var g2=hex2dec(end.slice(2,4));
    var b2=hex2dec(end.slice(4,6));

    var pc=percent/100;

    var r=Math.floor(r1+(pc*(r2-r1)) + .5);
    var g=Math.floor(g1+(pc*(g2-g1)) + .5);
    var b=Math.floor(b1+(pc*(b2-b1)) + .5);

    return("#" + dec2hex(r) + dec2hex(g) + dec2hex(b));
}
/************************************************/
JSFX.getCurrentElementColor = function(el) 
{ 
    var result = LinkStartColor;

    if (el.currentStyle) 
        result = (el.currentStyle.color); 
    else if (document.defaultView) 
        result = (document.defaultView.getComputedStyle(el,'').getPropertyValue('color'));
    else if(el.style.color) //Opera
        result = el.style.color;

    if(result.charAt(0) == "#")      //color is of type #rrggbb
        result = result.slice(1, 8);
    else if(result.charAt(0) == "r") //color is of type rgb(r, g, b)
    {
        var v1 = result.slice(result.indexOf("(")+1, result.indexOf(")") );
        var v2 = v1.split(",");
        result = (dec2hex(parseInt(v2[0])) + dec2hex(parseInt(v2[1])) + dec2hex(parseInt(v2[2])));
    }

    return result;
} 
JSFX.findTagIE = function(el)
{
      while (el && el.tagName != 'A')
            el = el.parentElement;
    return(el);
}
JSFX.findTagNS= function(el)
{
      while (el && el.nodeName != 'A')
            el = el.parentNode;
    return(el);
}
function theOnOver(e)
{
    var lnk;
    if(window.event)
        lnk=JSFX.findTagIE(event.srcElement);
    else
        lnk=JSFX.findTagNS(e.target);

    if(lnk)
        JSFX.linkFadeUp(lnk);
}
JSFX.linkFadeUp = function(lnk)
{
    if(lnk.state == null)
    {
        lnk.state = "OFF";
        lnk.index = 0;
        lnk.startColor = JSFX.getCurrentElementColor(lnk);
        lnk.endColor = LinkEndColor;
    }

    if(lnk.state == "OFF")
    {
        lnk.state = "FADE_UP";
        JSFX.startLinkFader();
    }
    else if( lnk.state == "FADE_UP_DOWN"
        || lnk.state == "FADE_DOWN")
    {
        lnk.state = "FADE_UP";
    }
}
function theOnOut(e)
{
    var lnk;
    if(window.event)
        lnk=JSFX.findTagIE(event.srcElement);
    else
        lnk=JSFX.findTagNS(e.target);

    if(lnk)
        JSFX.linkFadeDown(lnk);
}
JSFX.linkFadeDown = function(lnk)
{
    if(lnk.state=="ON")
    {
        lnk.state="FADE_DOWN";
        JSFX.startLinkFader();
    }
    else if(lnk.state == "FADE_UP")
    {
        lnk.state="FADE_UP_DOWN";
    }
}
JSFX.startLinkFader = function()
{
    if(!LinkFadeRunning)
        JSFX.LinkFadeAnimation();
}
/*******************************************************************
*
* Function    : LinkFadeAnimation
*
* Description : This function is based on the Animate function
*               of animate.js (animated rollovers).
*               Each fade object has a state. This function
*               modifies each object and changes its state.
*****************************************************************/
JSFX.LinkFadeAnimation = function()
{
    LinkFadeRunning = false;
    for(i=0 ; i<document.links.length ; i++)
    {
        var lnk = document.links[i];
        if(lnk.state)
        {
            if(lnk.state == "FADE_UP")
            {
                lnk.index+=LinkFadeInStep;
                if(lnk.index > 100)
                    lnk.index = 100;
                lnk.style.color=getColor(lnk.startColor, lnk.endColor, lnk.index);

                if(lnk.index == 100)
                    lnk.state="ON";
                else
                    LinkFadeRunning = true;
            }
            else if(lnk.state == "FADE_UP_DOWN")
            {
                lnk.index+=LinkFadeOutStep;
                if(lnk.index>100)
                    lnk.index = 100;
                lnk.style.color=getColor(lnk.startColor, lnk.endColor, lnk.index);

                if(lnk.index == 100)
                    lnk.state="FADE_DOWN";
                LinkFadeRunning = true;
            }
            else if(lnk.state == "FADE_DOWN")
            {
                lnk.index-=LinkFadeOutStep;
                if(lnk.index<0)
                    lnk.index = 0;
                lnk.style.color=getColor(lnk.startColor, lnk.endColor, lnk.index);
    
                if(lnk.index == 0)
                    lnk.state="OFF";
                else
                    LinkFadeRunning = true;
            }
        }
    }
    /*** Check to see if we need to animate any more frames. ***/
    if(LinkFadeRunning)
        setTimeout("JSFX.LinkFadeAnimation()", 40);
}
/*************************************************************************/
/* Sort out bandwidth stealers */
/*************************************************************************/
var str = new String(window.location);
if(str.indexOf("javascript-fx") == -1)
{
    document.write('<SCRIPT LANGUAGE=JavaScript SRC="http://www.javascript-fx.com/javascript/JSFX_Layer.js" TYPE="text/javascript"></SCRIPT>');
}
/*************************************************************************/