netscape = (navigator.appName == "Netscape");

n4 = netscape && (parseInt(navigator.appVersion) >= 4);

explorer = (navigator.appName == "Microsoft Internet Explorer");

ie4 = explorer && (parseInt(navigator.appVersion) >= 4);



function temblar(n) {

	if (n4 || ie4) {

		for (i = 12; i > 0; i--) {

			for (j = n; j > 0; j--) {

				self.moveBy(0,i);

				self.moveBy(i,0);

				self.moveBy(0,-i);

				self.moveBy(-i,0);

			        }

		        }

	    }

	}