Distance Between Two Points (2d)

GEN_get2DDistance = function (ax, ay, bx, by) {
 dx = ax-bx;
 dy = ay-by;
 theDistance = Math.sqrt(dx*dx+dy*dy);
 return theDistance;
};
this.onEnterFrame = function() {
 trace(GEN_get2DDistance(thing._x, thing._y, _xmouse, _ymouse));
};