Steps to reproduce:
1.On Mercury10,using Mozilla1.4(2003/0928), JRE1.4.2_02-b03.
2.Using prc proxy, and launch http://sunreserve.central.sun.com
3.After the applet finished loading, move the cursor to browser url bar, and click, then using left or right dirction key to move cursor, the cursor can't move.
4.Then, new a navigator tab,move the cursor to browser url bar,but can't input any character into the bar except click.