var speed=1;
var iens6=document.getElementById;
var coord = 0;
var scroll_down_var, scroll_up_var;


function scrollDown(){
if (window.scroll_up_var) 
	clearTimeout(scroll_up_var);
if (iens6 && parseInt(crossobj.style.top)>=(content_height*(-1)+100)){
	crossobj.style.top=parseInt(crossobj.style.top)-speed;
	document.getElementById("down").removeAttribute("href");
	document.getElementById("up").href=("javascript:scrollUp()");
	scroll_down_var=setTimeout("scrollDown()",100);
	}
}

function scrollUp(){
if (window.scroll_down_var) 
	clearTimeout(scroll_down_var);
if (iens6&&parseInt(crossobj.style.top)<=0){
	crossobj.style.top=parseInt(crossobj.style.top)+speed;
	document.getElementById("up").removeAttribute("href");
	document.getElementById("down").href=("javascript:scrollDown()");
	scroll_up_var=setTimeout("scrollUp()",100);
	}

}

function stopScroll(){
if (window.scroll_up_var) 
	clearTimeout(scroll_up_var);
if (window.scroll_down_var) 
	clearTimeout(scroll_down_var);
document.getElementById("up").href=("javascript:scrollUp()");
document.getElementById("down").href=("javascript:scrollDown()");	
}

function scrollTop(){
stopScroll();
if (iens6)
	crossobj.style.top=0;
}

function scrollBottom(){
stopScroll();
if (iens6)
	crossobj.style.top=-150;
}

function increaseSpeed(){
if(speed < 10)
	speed++;
}

function decreaseSpeed(){
if(speed > 1)
	speed--;
}

function getContentHeight(){
if (iens6)
	content_height=crossobj.offsetHeight;
}
window.onload=getContentHeight();