Jquery plug-in jbox closed with iframe _ jquery

Recently, a pop-up window is required. If JBox is good and iframe is supported, but an error is found, add a button in iframe and click this button to call the close method to close the window, there is no way to close it, because the close method requires a parameter. The parameter should be the iframe, but the input does not take effect. I don't know why I did not find a solution on the Internet ..
At last, I had to change the source code and add the following code in the first sentence of the close method:
If (box = undefined ){
Box = jBox. boxes [0];
}
Use window. parent. window. jBox. close (); To call this method.