Jquery plug-in jbox closed with iframe

This button calls the close method to close the function. In the pop-up window, there is no way to close the function, because the close method requires a parameter. The parameter should be the iframe but it is not effective to pass in it, I don't know why I cannot 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.