Why is corrupted design with changing PATH?

I have seen and tested many times. I have variable code like:
$PATH1 = “http://” . $_SERVER[‘HTTP_HOST’].”/”;
$PATH2 = $_SERVER[‘DOCUMENT_ROOT’].”/”;

and included file with code like:

[code=php] <?PHP @require_once($PATH1.”en-US/footer/footer.php”);?> [/code]

Issue is if I use PATH1 it will work nice design, but if I use $PATH2 it will be corrupted design within IE. I noticed in the past that image should be in the same line as TD (table) and influences design within IE. But I do not get it why influences DOCUMENT_ROOT variable with corrupted design as PATH is correct.

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