// ============================================================
// scroll
// ============================================================

function lib_bwcheck(){
    this.ver=navigator.appVersion
    this.agent=navigator.userAgent
    this.dom=document.getElementById?1:0
    this.opera5=this.agent.indexOf("Opera 5")>-1
    this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom && !this.opera5)?1:0; 
    this.ie6=(this.ver.indexOf("MSIE 6")>-1 && this.dom && !this.opera5)?1:0;
    this.ie4=(document.all && !this.dom && !this.opera5)?1:0;
    this.ie=this.ie4||this.ie5||this.ie6
    this.mac=this.agent.indexOf("Mac")>-1
    this.ns6=(this.dom && parseInt(this.ver) >= 5) ?1:0; 
    this.ns4=(document.layers && !this.dom)?1:0;
    this.bw=(this.ie6 || this.ie5 || this.ie4 || this.ns4 || this.ns6 || this.opera5)
    return this
}

var bw = new lib_bwcheck();
var speed = 30;
var loop, timer;
var oScroll;

function makeObj(obj,nest){
    nest=(!nest) ? "":'document.'+nest+'.'
    this.el=bw.dom?document.getElementById(obj):bw.ie4?document.all[obj]:bw.ns4?eval(nest+'document.'+obj):0;
    this.css=bw.dom?document.getElementById(obj).style:bw.ie4?document.all[obj].style:bw.ns4?eval(nest+'document.'+obj):0;
    this.scrollHeight=bw.ns4?this.css.document.height:this.el.offsetHeight
    this.clipHeight=bw.ns4?this.css.clip.height:this.el.offsetHeight
    this.up=goUp;this.down=goDown;
    this.moveIt=moveIt; this.x=0; this.y=0;
    this.obj = obj + "Object"
    this.scroll = scroll;
    eval(this.obj + "=this")
    return this
}

var px = bw.ns4||window.opera?"":"px";

function moveIt(x,y){
    this.x = x
    this.y = y
    this.css.left = this.x+px
    this.css.top = this.y+px
}

function goDown(move){
    if (this.y>-this.scrollHeight+oCont.clipHeight){
        this.moveIt(0,this.y-move)
            if (loop) setTimeout(this.obj+".down("+move+")",speed)
    }
}

function goUp(move){
    if (this.y<0){
        this.moveIt(0,this.y-move)
        if (loop) setTimeout(this.obj+".up("+move+")",speed)
    }
}

function scroll(speed){
    if (scrolltextLoaded){
        loop = true;
        if (speed>0) {
            oScroll.down(speed);
        } else {
            oScroll.up(speed);
        }
    }
}

function noScroll() {
    loop = false;
    if (timer) clearTimeout(timer);
}

var scrolltextLoaded = false;

function scrolltextInit(){
    
    oCont   = new makeObj('divScrollTextCont');
    oScroll = new makeObj('divText','divScrollTextCont');
    oScroll.moveIt(0,0);
    scrolltextLoaded = true;
}