<!doctype html>
<html>
<body>
<script>
function Point(xpos, ypos){
this.x=xpos;
this.y=ypos;
}
Point.prototype.getDistance=function(p){
return Math.sqrt(this.x*this.x+this.y*this.y);
}
var p1=new Point(10,20);
var d1=p1.getDistance();
var p2=new Point(10,30);
var d2=p2.getDistance();
doucument.writeln(d1+"<br />");
doucument.writeln(d2+"<br />");
</script>
</body>
</html>