I have a simple website that provides a free 1500 page physics textbook for all. On my mac, the site looks exactly as I want it. But on IE6 on PCs, many things go wrong. (the site is http://www.motionmountain.net ) All problems are related to the css in http://www.motionmountain.net/motionmountain.css Changing the "position: relative" to "position: absolute" in the code below, which describes the middle, main column, has almost no effect on the mac, but dramatic effects on the PC: .content { position:relative; /* in PCs: gives strange floating problems */ z-index:1000; left:150px; margin:0px; margin-right:415px; /* for PCs */ padding-top:46px; padding-left:120px; padding-right:10px; padding-bottom:20px; width:auto; text-align:left; font-family:Verdana,Tahoma,Arial,Helvetica,Sans,Gill,sans-serif; font-size:0.7em; line-height:1.5; color:black; background-image:url(IMAGES/pic2.gif) ; background-position:left top; background-repeat:no-repeat; } On PCs, on the home page, "position relative" makes the outer two menus behave in the way I want (hovering works over the whole block, not only when the pointer is on the text) but in exchange, the effect is lost on the red "download the text" line. On PCs, the position of the left lower graph changes, depending on whether I set position:relative or position:absolute on the middle column. On the page http://www.motionmountain.net/text.html, the right image float behind the text on IE6, but float perfectly on firefox. The same problem happens with the pdf and zip icons. Obviously, I am not understanding something here. Can somebody explain all this to me? Thank you a lot in advance! Christoph