You have a couple of validation errors that need sorting first. Any remaining issues with IE7 are best dealt with via conditional comment CSS:
http://quirm.net/2009/06/29/wordpress-conditional-comment-css/
Ok, I corrected the validation errors and I understand I need to make another css for IE, right? But I don’t know what I have to change in my original CSS to make it look right in IE. :/
it might work without a conditional IE css:
a few things to adapt in style.css:
body, h1, h2, h3, h4, h5, h6, blockquote, p, form, ul, ul li, ul ul, ul ul li {
margin : 0;
padding : 0;
}
#container {
width : 590px;
background: url('http://i78.photobucket.com/albums/j98/klewyx/posta_bg_ap.png') repeat-y top left;
float: left;margin-top:-5px;
}
.sidebar {
background: url('http://i78.photobucket.com/albums/j98/klewyx/side_ap_.png') repeat-y top left;
float: left;
padding: 0px 0px 0px 0px;
text-align: left;
width: 210px;
margin-top:-5px;
}
.sidebar ul {
font-family : Georgia, Sans-serif;
margin-left : 40px;
}
.sidebar ul li#search {margin-top:5px;}
preview with dreamweaver looked ok in IE7 and Firefox – not tested in other browsers.