var obj_scroll="area";
function getposition(val){
	if((document.getElementById('area').scrollTop>0)&&(document.getElementById('area').scrollTop<document.getElementById('area').scrollHeight)){
		document.getElementById('area').scrollTop +=val;
	}
}

var flag = true;
var inter2 = 0;
function moves(val) {
	flag = true;
	val*=2;
	inter2=setInterval("moving('"+val+"')",100);
};

function leave(){
	flag = false;
	clearInterval(inter2);
}

function moving(val){
	if (flag) {
		document.getElementById(obj_scroll).scrollTop += parseInt(val);
	} else {
		clearInterval(inter2);
	}
}