//Gradual Elements Fader- By Dynamic Drive at http://www.dynamicdrive.com
//Last updated: Nov 8th, 07'

var gradualFader={}

gradualFader.baseopacity=0.3 //set base opacity when mouse isn't over element (decimal below 1)
gradualFader.increment=0.1 //amount of opacity to increase after each iteration (suggestion: 0.1 or 0.2)

document.write('<style type="text/css">\n') //write out CSS to enable opacity on "gradualfader" class
document.write('.gradualfader{filter:progid:DXImageTransform.Microsoft.alpha(opacity='+gradualFader.baseopacity*100+'); -moz-opacity:'+gradualFader.baseopacity+'; opacity:'+gradualFader.baseopacity+';}\n')
document.write('</style>')

gradualFader.setopacity=function(obj, value){ //Sets the opacity of targetobject based on the passed in value setting (0 to 1 and in between)
        var targetobject=obj
        if (targetobject && targetobject.filters && targetobject.filters[0]){ //IE syntax
                if (typeof targetobject.filters[0].opacity=="number") //IE6
                        targetobject.filters[0].opacity=value*100
                else //IE 5.5
                        targetobject.style.filter="alpha(opacity="+value*100+")"
                }
        else if (targetobject && typeof targetobject.style.MozOpacity!="undefined") //Old Mozilla syntax
                targetobject.style.MozOpacity=value
        else if (targetobject && typeof targetobject.style.opacity!="undefined") //Standard opacity syntax
                targetobject.style.opacity=value
        targetobject.currentopacity=value
}

gradualFader.fadeupdown=function(obj, direction){
        var targetobject=obj
        var fadeamount=(direction=="fadeup")? this.increment : -this.increment
        if (targetobject && (direction=="fadeup" && targetobject.currentopacity<1 || direction=="fadedown" && targetobject.currentopacity>this.baseopacity)){
                this.setopacity(obj, targetobject.currentopacity+fadeamount)
                window["opacityfader"+obj._fadeorder]=setTimeout(function(){gradualFader.fadeupdown(obj, direction)}, 50)
        }
}

gradualFader.clearTimer=function(obj){
if (typeof window["opacityfader"+obj._fadeorder]!="undefined")
        clearTimeout(window["opacityfader"+obj._fadeorder])
}

gradualFader.isContained=function(m, e){
        var e=window.event || e
        var c=e.relatedTarget || ((e.type=="mouseover")? e.fromElement : e.toElement)
        while (c && c!=m)try {c=c.parentNode} catch(e){c=m}
        if (c==m)
                return true
        else
                return false
}

gradualFader.fadeinterface=function(obj, e, direction){
        if (!this.isContained(obj, e)){
                gradualFader.clearTimer(obj)
                gradualFader.fadeupdown(obj, direction)
        }
}

gradualFader.collectElementbyClass=function(classname){ //Returns an array containing DIVs with specified classname
        var classnameRE=new RegExp("(^|\\s+)"+classname+"($|\\s+)", "i") //regular expression to screen for classname within element
        var pieces=[]
        var alltags=document.all? document.all : document.getElementsByTagName("*")
        for (var i=0; i<alltags.length; i++){
                if (typeof alltags[i].className=="string" && alltags[i].className.search(classnameRE)!=-1)
                        pieces[pieces.length]=alltags[i]
        }
        return pieces
}

gradualFader.init=function(){
        var targetobjects=this.collectElementbyClass("gradualfader")
        for (var i=0; i<targetobjects.length; i++){
                targetobjects[i]._fadeorder=i
                this.setopacity(targetobjects[i], this.baseopacity)
                targetobjects[i].onmouseover=function(e){gradualFader.fadeinterface(this, e, "fadeup")}
                targetobjects[i].onmouseout=function(e){gradualFader.fadeinterface(this, e, "fadedown")}
        }
}