how to refresh parent window when it is in different system

hi
how to refresh parent window when i click child window close buton when both the files are in different system ;parent window is is my system say http://chaitanya/ecrm/ex.jsp;in the ex.jsp one hyper link is there when i click this href child window will come that is in another system;the child window is in different server say htp://chakri/csc/Attend.jsp;when i click child window javascript error (i.e) permission denied error is coming;the parent window is in iframe;plz tell me how to solve this problem ;

You can't. Imagine the mayhem that would ensue if arbitrary web pages could manipulate others via Javascript.
bear