A problem with one variant of the bookmark form

Well, I have a problem with one variant of the bookmark form; you see, on the http://tadej-ivan.50webs.com/index.html where I use input type="button" there is no redirect at all after pressing the "Bookmark" button, but on my other website http://tadejpersic.50webs.com/index.html where I use type="image" instead, the visitor is redirected to some strange URL that I guess is generated randomly.


The three examples of the mentioned redirect:

http://tadejpersic.50webs.com/?x=7&y=5&index=#

Code (markup):

http://tadejpersic.50webs.com/?x=5&y=9&index=#

Code (markup):

http://tadejpersic.50webs.com/?x=8&y=15&index=#

Code (markup):

The code on the "tadej-ivan.50webs.com" variant:

<form action="#" /><input type="button" value="Bookmark" onclick="bookmark('http://tadej-ivan.50webs.com/index.html','Tadej\'s computing homepage')" />

Code (markup):

The code on the "tadejpersic.50webs" variant:

<form action="#">bookmark: <input type="image" src="save.png" title="bookmark page" onclick="bookmark('http://tadejpersic.50webs.com/about-site.html','Tadej Persic\'s website | about site')" /></form>

Code (markup):

Oh and regarding the second example-code above, I guess it could also be without the closing </form> tag but with <form action="#" /> as in the first example above, also see the recent A banal question on two variants of 'form' code thread that I opened here on DP forums.


So I am asking you, does anyone have any idea why the difference??!


P.S. - I also wrote about this problem in the A strange problem/situation with some particular form thread, and under the last "P.S." paragraph in my first/initial post in theA bookmark form adds 'Load in sidebar' in Firefox thread that I also opened here on DP forums.


Thanks in advance, tayiper