DnD.prototype.saveEvent = function()
{
	this.saveMove = document.onmousemove;
	this.saveUp = document.onmouseup;
	document.onmousemove=this.move;
	document.onmouseup=this.stop;
}

DnD.prototype.restoreEvent = function()
{
	document.onmousemove=this.saveMove;
	document.onmouseup=this.saveUp;
}