I put your code into BBEdit and used doc type 4.01 Transitional and these are the errors it gives...maybe something in one of those????
Line 3: Optional open tag for element <HTML> not specified.
Line 3: Optional open tag for element <HEAD> not specified.
Line 3: Close tag for element </head> specified, but open tag was implied(omitted).
Line 7: Document type doesn't permit attribute topmargin within element <body>.
Line 7: Document type doesn't permit attribute leftmargin within element <body>.
Line 7: Document type doesn't permit attribute marginwidth within element <body>.
Line 7: Document type doesn't permit attribute marginheight within element <body>.
Line 7: Element <body> implicitly closed here.
Line 7: Value of attribute bgcolor for element <body> is invalid; Value isn't hex color spec or predefined color.
Line 7: Element <script> requires that the attribute type be specified.
Line 25: Document type does not permit element <style> in content of element <body>.
Line 25: Document type doesn't permit attribute id within element <style>.
Line 84: Document type does not permit element <meta> in content of element <body>.
Line 85: Document type does not permit element <link> in content of element <body>.
Line 86: Close element </head> found but element wasn't open.
Line 87: Element <body> implicitly closed here.
Line 87: Document type doesn't permit attribute topmargin within element <body>.
Line 87: Document type doesn't permit attribute leftmargin within element <body>.
Line 87: Document type doesn't permit attribute marginwidth within element <body>.
Line 87: Document type doesn't permit attribute marginheight within element <body>.
Line 89: Value of attribute codebase for element <object> is invalid; URL path needs encoding (/pub/shockwave/cabs/flash/swflash.cab#version%3D6,0,29,0).
Line 92: Unknown or malformed element: <embed>.
Line 92: Unknown or malformed close element: </embed>.
Line 92: Value of attribute codebase for element <object> is invalid; URL path needs encoding (/pub/shockwave/cabs/flash/swflash.cab#version%3D6,0,29,0).
Line 96: Unknown or malformed element: <embed>.
Line 96: Unknown or malformed close element: </embed>.
Line 104: Element <img> requires that the attribute alt be specified.
Line 117: Unknown or malformed element: <position>.
Line 125: Unknown or malformed element: <position>.
Line 132: Unknown or malformed element: <position>.
Line 139: Unknown or malformed element: <position>.
Line 146: Unknown or malformed element: <position>.
Line 158: Element <img> requires that the attribute alt be specified.
Line 163: Element <script> requires that the attribute type be specified.
Line 171: Unknown or malformed element: <next>.
Line 173: Element <p> implicitly closed here.
Line 174: Element <p> implicitly closed here.
Line 177: Element <img> requires that the attribute alt be specified.
Line 179: Element <img> requires that the attribute alt be specified.
Line 183: Close element </div> found but element wasn't open.
Line 206: Unknown or malformed element: <next>.
Line 211: Document type does not permit element <table> in content of element <table>.
Line 211: Document type doesn't permit attribute color within element <table>.
Line 213: Element <img> requires that the attribute alt be specified.
Line 185: Close tag for element </table> omitted but document type doesn't permit it.
Line 219: Unknown or malformed element: <last>.
Line 250: Element <img> requires that the attribute alt be specified.
Line 271: Unencoded entity found; & needs to be encoded as &.
Line 283: Element <img> requires that the attribute alt be specified.
Line 286: Element <img> requires that the attribute alt be specified.
Line 299: Element <img> requires that the attribute alt be specified.
Line 299: Element <img> requires that the attribute alt be specified.
Line 299: Element <img> requires that the attribute alt be specified.
Line 303: Element <img> requires that the attribute alt be specified.
Line 316: Element <p> implicitly closed here.
Line 316: Value of attribute src for element <img> is invalid; URL path needs encoding (img/%2Baaa.gif).
Line 316: Element <img> requires that the attribute alt be specified.
Line 326: Element <p> implicitly closed here.
Line 3: Close tag for element </html> specified, but open tag was implied(omitted).
Any of these errors you "know" are correct do not change but it may be a starting place...I would definitely remove all the <p> tags you have opened because your code says:
............. avoid <p></p>'s there is a margin's problem in IE Mac and Mozilla -->
If that is not the correct doctype let me know. My apologies but I'm out of suggestions..:(
MNS