//Detectamos el navegador
function checkBrowser(){
 this.ver=navigator.appVersion
 this.dom=document.getElementById?1:0
 this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom)?1:0;
 this.ie4=(document.all && !this.dom)?1:0;
 this.ns5=(this.dom && parseInt(this.ver) >= 5) ?1:0;
 this.ns4=(document.layers && !this.dom)?1:0;
 this.bw=(this.ie5 || this.ie4 || this.ns4 || this.ns5)	
	
 return this}

 bw=new checkBrowser()

 //Velocidad del scroll 
 var speed=70;

//Declaración de variables
 var loop, timer

//Objeto constructor
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; 
   this.y; 
   this.obj = obj + "Object"
   eval(this.obj + "=this")
   return this
}

//Función que hace que el objeto se desplace
function moveIt(x,y){	
 this.x=x;	
 this.y=y	
 this.css.left=this.x
 this.css.top=this.y
}

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

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

//Llama a la función para mover ya sea arriba o abajo
function scroll(speed){
   if(loaded){
      loop=true;
	if(speed>0) oScroll.down(speed)
	else oScroll.up(speed)	
   }
}

//Stops the scrolling (called on mouseout)
function noScroll(){
 	loop=false
	if(timer) clearTimeout(timer)
}

//Makes the object
var loaded;

function scrollInit(){
 oCont=new makeObj('divContenido')
 oScroll=new makeObj('divTexto','divContenido')
 oScroll.moveIt(0,0)
 oCont.css.visibility='visible'
 loaded=true;
}

//Call the init on page load

onload=scrollInit;