Around line 60, change allthe below   
  
#TB_window {   
position: fixed;   
background: #ffffff;   
z-index: 102;   
color:#000000;   
display:none;   
border: 4px solid #525252;   
text-align:left;   
top:50%;   
left:50%;   
}    
  
To this (cut'n'paste it all) and the orginal one will still be there but highlighted out for reference.   
  
/* Orginal install css   
#TB_window {   
position: fixed;   
background: #ffffff;   
z-index: 102;   
color:#000000;   
display:none;   
border: 4px solid #525252;   
text-align:left;   
top:50%;   
left:50%;   
}   
*/   
#TB_window { /* my IE7 Hack*/   
position: fixed;   
background: #ffffff;   
z-index: 102;   
color:#000000;   
display:none;   
border: 4px solid #525252;   
text-align:left;   
bottom:10%;   
left:50%;   
}