multiple windows

i have a main window that opens another window(index) and the index opens a second window. i need a button in the index that changes the background color of the first window to red and also closes all the windows.

windows[0] = window.open( "blabla" );
windows[1] = window.open( "blabla" );

in the button you do:
onclick="javascript:this.windows[0].document.bgcolor (or another property, you'll have to look that up) = "red";

to close:
for( i = 0; i < windows.length; i++ ) windows[i].close