Difference between href and reload for refreshing in javascript

#1.Response.Write("<script language=javascript>window.parent.rightFrame.location.reload();</script>");
#2.Response.Write("<script language=javascript>window.parent.rightFrame.location.href  = window.parent.rightFrame.location;</script>");

the two ways above are what I used to refresh page in a project, but I found there are some differences between them.

when I used the first way, the page will popup a dialog below.