/******************************************************************* 
* 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="FF3F3F"

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 && lnk.className.indexOf("fadeLink") != -1)
                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 && lnk.className.indexOf("fadeLink") != -1)
                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);
}