Webiste I've created. PHP/HTML Style Sheet Link Conflicts

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Alright here is my question. I have been working on a website and i am attempting to add in a login form to it. The problem I am having is this. the login in form is in PHP and has it's own CSS. The website is in html for the most part but has it's own CSS. The links are conflicting. The links to the CSS. If I paste the website in to php file with all of the CSS links. the ones that came with the login form and the ones that came with my website the website loads with the styling but is a bit off. the login form only loads the drop down part of it but the styling does not appear. If i delete the CSS link for the website the website obviously loads but not styled and the login form loads just fine. The login form is a drop down menu that is suppose to load at the top of every page. Does anyone know how I can fix this?WebsiteI have created a domain and uploaded a downloaded website and the form to it for example. The site currently has the PHP CSS links but not the two CSS links for the website that are conflicting. Here are CSS linksPHP Logon form CSS Links:<link rel="stylesheet" type="text/css" href="http://stackoverflow.com/questions/14078425/demo.css" media="screen" /><link rel="stylesheet" type="text/css" href="http://stackoverflow.com/questions/14078425/login_panel/css/slide.css" media="screen" />Website CSS Links: <link rel="stylesheet" href="http://stackoverflow.com/questions/14078425/css/reset.css" type="text/css" media="screen"> <link rel="stylesheet" href="http://stackoverflow.com/questions/14078425/css/style.css" type="text/css" media="screen"> <link rel="stylesheet" href="http://stackoverflow.com/questions/14078425/css/grid.css" type="text/css" media="screen"> <link rel="stylesheet" href="http://stackoverflow.com/questions/14078425/css/prettyPhoto.css" type="text/css" media="screen"> I currently have the links all within the tags.EDIT: The issue is with the reset.css and style.css links. If i take the links out the form works but as i said the site wont work. The styles that is. If i put them in the the form wont work but the site will. Although the site is a bit off. If i take the style.css out but leave the reset.css the reset.css is effecting the style of the form.