Hjælp til master dokument

Hvordan sørger jeg for at min sidebar følger min content del uden at skal sætte en masse <p></p> ind for at nå niveau? Har prøvet alt. Har vedlagt mit stylesheet:

Se side her:
www.templateuniverse.eu/test/test.html

/* CSS Document */
/*master document*/
body{
margin: 0;
padding: 0;
background-image:url(images/bg.jpg);
background-repeat: repeat-x;
font-family: Arial, Helvetica, sans-serif;
font-size: 12px;
color: #333333;
}

#Wrap{
width: 740px;
background-color:#ffffff;
}

#PSD_menu{
width: 97%;
padding: 11px;
height: 76px;
border: none;
background-image:url(images/menu.jpg);
}

#header{
background-image:url(images/big-header.jpg);
height:180px;
}

#header2{
background-image:url(images/big-header_product.jpg);
height:180px;
}

#header3{
background-image:url(images/big-header_we_offer.jpg);
height:180px;
}

#content{
width: 495px;
float: left;
height: auto;
background-color: #FFFFFF;
}

#inside_content{
width: 95%;
margin: 10px 10px 10px 10px;
}

#sidebar{
width: 245px;
float: left;
background-color: #CCCCCC;
height: auto;
}

#inside_sidebar{
width: 90%;
margin: 10px 10px 10px 10px;
font-size: 11px;
}

#bottom{
clear:both;
width: 730px;
height: 40px;
font-size: 11px;
padding-left: 10px;
background-image:url(images/bottom_header.jpg);
}

/*generic stuff*/

#specs{
font-size: 10px;
}

h1{
font-family: Trebuchet MS, Tahoma, Verdana;
font-size:20px;
color:#333333;
font-stretch: narrower;
}

h2{
font-family: Trebuchet MS, Tahoma, Verdana;
font-size:15px;
color:#333333;
font-stretch: narrower;
}

/*--menu--*/