why does <form> insertion mess up alignment?

[futureknight]

I'm curious, how come the placement of the form declaration upsets my alignment of images? I already had the input field inserted into the proper place, but then I noticed that the image I'm using for my submit button was above (ie, outside) the form declaration. I moved the form declaration into a different cell (therefore putting my submit image inside the form), but now my carefully aligned top images are off a bit.

Isn't the form declaration invisible as far as the browser is concerned? why would the placement of an invisible thing, so to speak, upset alignment?

thanks in advance for any assistance

[BlobFisk]

Actually the form element does have an effect, but it can be negated using CSS:

form {
margin: 0;
display: inline;
}

Technically the <form> decleration should be outside the <table> rather than within a cell.

HTH