Change then focus in browser tabs

[daveWare]

Hello,I'm trying to run a js that will open a child window, or if the window is already open, change the focus to that window. Here is the script:

//use this one in Shoppingfunction openDes() { 	if (window.opener && !window.opener.closed) {							// if the opener is closed			window.opener.focus();									   // change the focus to the opener: does not work in tabs: domainsecurity issue (?)		} else {			window.open('http://designer.kaneva.com/', 'designer');			    // open designer in a new window			}	}	

the script works perfect if the pages are open in 2 different windows. However if the pages are open in tabs i can't change focus or even close one of the pages. the pages are sitting in 2 sub domains:http://shop.kaneva.com/andhttp://designer.kaneva.com/is there a way to change the focus to the opener when tabs are being used? Thank you,Dave