Stuff

//calculating flipping process
	pages.flip._visible = true;
	pages.flip.p3shadow._visible = pages.pgrad._visible = !tear;
	pages.flip.p2._visible = pages.flip.p3._visible = true;
	//equation of the line
	var vx = x-sx;
	var vy = y-sy;
	var a1 = vy/vx;
	var a2 = -vy/vx;
	
	cx = sx+(vx/2);
	cy = sy+(vy/2);
	//trigonometriai szamitasok
	//calculating rotation of the page, and the masks
	var r = Math.sqrt((sx-x)*(sx-x)+(sy-y)*(sy-y));
	var a = Math.asin((sy-y)/r);
	if(sx<0) a = -a;	
	ad = a/AM; 	//in degree
	pageN._rotation = ad*2;
	r = Math.sqrt((sx-x)*(sx-x)+(sy-y)*(sy-y));
	rl = (pw*2);
	if(sx>0) { 				//flip forward
		pages.mask._xscale = 100;
		nx = cx-Math.tan(a)*(ph/2-cy);
		ny = ph/2;
		if(nx>pw) {
			nx = pw;
			ny = cy+Math.tan(Math.PI/2+a)*(pw-cx);
		}
		pageN.pf._x = -(pw-nx);
		pages.flip.fgrad._xscale = (r/rl/2)*pw;
		pages.pgrad._xscale = -(r/rl/2)*pw;
		pages.flip.p3shadow._xscale = (r/rl/2)*pw;
	} else { 				//flip backward
		pages.mask._xscale = -100;
		nx = cx-Math.tan(a)*(ph/2-cy);
		ny = ph/2;
		if(nx<-pw) {
			nx = -pw;
			ny = cy+Math.tan(Math.PI/2+a)*(-pw-cx);
		}
		pageN.pf._x = -(pw-(pw+nx));
		pages.flip.fgrad._xscale = -(r/rl/2)*pw;
		pages.pgrad._xscale = (r/rl/2)*pw;
		pages.flip.p3shadow._xscale = -(r/rl/2)*pw;
	}
	pages.mask._x = cx;
	pages.mask._y = cy;
	pages.mask._rotation = ad;
	pageN.pf._y = -ny;
	pageN._x = nx+offs;
	pageN._y = ny;
	pages.flip.fgrad._x = cx;
	pages.flip.fgrad._y = cy;
	pages.flip.fgrad._rotation = ad;
	pages.flip.fgrad._alpha = (r>(rl-50))? 100-(r-(rl-50))*2: 100;
	pages.flip.p3shadow._x = cx;
	pages.flip.p3shadow._y = cy;
	pages.flip.p3shadow._rotation = ad;
	pages.flip.p3shadow._alpha = (r>(rl-50))? 100-(r-(rl-50))*2: 100;
	pages.pgrad._x = cx;
	pages.pgrad._y = cy;