Ajax Calendar Not Working Properly

Revision 2
Hi all, i am having a problem with the ajaxtoolkit calendar. When the page first loads and i click in the textbox the calendar pops up fine but when i click on the month or year at the top of the calendar it just messes up the whole calendar.

this is on the asp side:

<ajaxToolkit:CalendarExtender ID="calender_start_date" CssClass="red" runat="server" TargetControlID="TextBox1" PopupPosition="Right" Format="yyyy-MM-dd">
<asp:TableCell><asp:TextBox ID="TextBox_name" runat="server" Width="153px">

and the css:

.red .ajax__calendar_container
{
width:190px;
background-color: #ffffff; border:solid 1px #eeeeee;
-moz-border-radius-topleft: 8px/*{cornerRadius}*/; -webkit-border-top-left-radius: 8px/*{cornerRadius}*/; -khtml-border-top-left-radius: 8px/*{cornerRadius}*/; border-top-left-radius: 8px/*{cornerRadius}*/;
-moz-border-radius-topright: 8px/*{cornerRadius}*/; -webkit-border-top-right-radius: 8px/*{cornerRadius}*/; -khtml-border-top-right-radius: 8px/*{cornerRadius}*/; border-top-right-radius: 8px/*{cornerRadius}*/;
-moz-border-radius-bottomleft: 8px/*{cornerRadius}*/; -webkit-border-bottom-left-radius: 8px/*{cornerRadius}*/; -khtml-border-bottom-left-radius: 8px/*{cornerRadius}*/; border-bottom-left-radius: 8px/*{cornerRadius}*/;
-moz-border-radius-bottomright: 8px/*{cornerRadius}*/; -webkit-border-bottom-right-radius: 8px/*{cornerRadius}*/; -khtml-border-bottom-right-radius: 8px/*{cornerRadius}*/; border-bottom-right-radius: 8px/*{cornerRadius}*/;
}
.red .ajax__calendar_body
{
width:180px;
height:150px;
background-color: #ffffff; border: solid 1px #eeeeee;
}
.red .ajax__calendar_header
{
background-color: #CC0505; margin-bottom: 8px;
-moz-border-radius-topleft: 4px/*{cornerRadius}*/; -webkit-border-top-left-radius: 4px/*{cornerRadius}*/; -khtml-border-top-left-radius: 4px/*{cornerRadius}*/; border-top-left-radius: 4px/*{cornerRadius}*/;
-moz-border-radius-topright: 4px/*{cornerRadius}*/; -webkit-border-top-right-radius: 4px/*{cornerRadius}*/; -khtml-border-top-right-radius: 4px/*{cornerRadius}*/; border-top-right-radius: 4px/*{cornerRadius}*/;
-moz-border-radius-bottomleft: 4px/*{cornerRadius}*/; -webkit-border-bottom-left-radius: 4px/*{cornerRadius}*/; -khtml-border-bottom-left-radius: 4px/*{cornerRadius}*/; border-bottom-left-radius: 4px/*{cornerRadius}*/;
-moz-border-radius-bottomright: 4px/*{cornerRadius}*/; -webkit-border-bottom-right-radius: 4px/*{cornerRadius}*/; -khtml-border-bottom-right-radius: 4px/*{cornerRadius}*/; border-bottom-right-radius: 4px/*{cornerRadius}*/;
}
.red .ajax__calendar_title
{
color: #ffffff; padding-top: 3px;
}
.red .ajax__calendar_next,
.red .ajax__calendar_prev
{
border:solid 2px #ffffff;
background-color: #ffffff;
-moz-border-radius-topleft: 18px/*{cornerRadius}*/; -webkit-border-top-left-radius: 18px/*{cornerRadius}*/; -khtml-border-top-left-radius: 18px/*{cornerRadius}*/; border-top-left-radius: 18px/*{cornerRadius}*/;
-moz-border-radius-topright: 18px/*{cornerRadius}*/; -webkit-border-top-right-radius: 18px/*{cornerRadius}*/; -khtml-border-top-right-radius: 18px/*{cornerRadius}*/; border-top-right-radius: 18px/*{cornerRadius}*/;
-moz-border-radius-bottomleft: 18px/*{cornerRadius}*/; -webkit-border-bottom-left-radius: 18px/*{cornerRadius}*/; -khtml-border-bottom-left-radius: 18px/*{cornerRadius}*/; border-bottom-left-radius: 18px/*{cornerRadius}*/;
-moz-border-radius-bottomright: 18px/*{cornerRadius}*/; -webkit-border-bottom-right-radius: 18px/*{cornerRadius}*/; -khtml-border-bottom-right-radius: 18px/*{cornerRadius}*/; border-bottom-right-radius: 18px/*{cornerRadius}*/;
}
.red .ajax__calendar_hover .ajax__calendar_next,
.red .ajax__calendar_hover .ajax__calendar_prev
{
border:solid 2px #f7f7f7;
background-color: #ffffff;
-moz-border-radius-topleft: 4px/*{cornerRadius}*/; -webkit-border-top-left-radius: 4px/*{cornerRadius}*/; -khtml-border-top-left-radius: 4px/*{cornerRadius}*/; border-top-left-radius: 4px/*{cornerRadius}*/;
-moz-border-radius-topright: 4px/*{cornerRadius}*/; -webkit-border-top-right-radius: 4px/*{cornerRadius}*/; -khtml-border-top-right-radius: 4px/*{cornerRadius}*/; border-top-right-radius: 4px/*{cornerRadius}*/;
-moz-border-radius-bottomleft: 4px/*{cornerRadius}*/; -webkit-border-bottom-left-radius: 4px/*{cornerRadius}*/; -khtml-border-bottom-left-radius: 4px/*{cornerRadius}*/; border-bottom-left-radius: 4px/*{cornerRadius}*/;
-moz-border-radius-bottomright: 4px/*{cornerRadius}*/; -webkit-border-bottom-right-radius: 4px/*{cornerRadius}*/; -khtml-border-bottom-right-radius: 4px/*{cornerRadius}*/; border-bottom-right-radius: 4px/*{cornerRadius}*/;
}
.red .ajax__calendar_dayname
{
text-align:center; margin-bottom: 4px; margin-top: 2px;
color:#000000;
}
.red .ajax__calendar_day,
.red .ajax__calendar_month,
.red .ajax__calendar_year
{
margin:1px 1px 1px 1px;
text-align:center;
border:solid 1px #eeeeee;
color:#000000;
background-color: #f3f3f3;
}
.red .ajax__calendar_hover .ajax__calendar_day,
.red .ajax__calendar_hover .ajax__calendar_month,
.red .ajax__calendar_hover .ajax__calendar_year
{
color: #ffffff; font-weight:bold; background-color: #328BC8;border:solid 1px #328BC8;
}
.red .ajax__calendar_active .ajax__calendar_day,
.red .ajax__calendar_active .ajax__calendar_month,
.red .ajax__calendar_active .ajax__calendar_year
{
color: #ffffff; font-weight:bold; background-color: #F7B64A;
}
.red .ajax__calendar_today .ajax__calendar_day
{
color: #CC0505; font-weight:bold; background-color: #ffffff;
}
.red .ajax__calendar_other,
.red .ajax__calendar_hover .ajax__calendar_today
{
color: #ffffff;
font-weight:bold;
}
.ajax__calendar_days
{
background-color: #ffffff;
}