function cons(a)
{
switch(a)
{ 
case 1:  window.open('http://www.ntutc.com/consoles/ca_1.jpg',"",'scrollbars=yes,resizable=yes,menubar=no,align=center,height=800,width=850'); break;
case 2:  window.open('http://www.ntutc.com/consoles/ca_2.jpg',"",'scrollbars=yes,resizable=yes,menubar=no,align=center,height=800,width=850'); break;
case 3:  window.open('http://www.ntutc.com/consoles/ca_3.jpg',"",'scrollbars=yes,resizable=yes,menubar=no,align=center,height=800,width=850'); break;
case 4:  window.open('http://www.ntutc.com/consoles/ca_4.jpg',"",'scrollbars=yes,resizable=yes,menubar=no,align=center,height=800,width=850'); break;

case 21:  window.open('http://www.ntutc.com/consoles/ct_1.jpg',"",'scrollbars=yes,resizable=yes,menubar=no,align=center,height=800,width=850'); break;
case 22:  window.open('http://www.ntutc.com/consoles/ct_2.jpg',"",'scrollbars=yes,resizable=yes,menubar=no,align=center,height=800,width=850'); break;
case 23:  window.open('http://www.ntutc.com/consoles/ct_3.jpg',"",'scrollbars=yes,resizable=yes,menubar=no,align=center,height=800,width=850'); break;

case 31:  window.open('http://www.ntutc.com/consoles/cn_1.jpg',"",'scrollbars=yes,resizable=yes,menubar=no,align=center,height=800,width=850'); break;
case 32:  window.open('http://www.ntutc.com/consoles/cn_2.jpg',"",'scrollbars=yes,resizable=yes,menubar=no,align=center,height=800,width=850'); break;
case 33:  window.open('http://www.ntutc.com/consoles/cn_3.jpg',"",'scrollbars=yes,resizable=yes,menubar=no,align=center,height=800,width=850'); break;
case 34:  window.open('http://www.ntutc.com/consoles/cn_4.jpg',"",'scrollbars=yes,resizable=yes,menubar=no,align=center,height=800,width=850'); break;
case 35:  window.open('http://www.ntutc.com/consoles/cn_5.jpg',"",'scrollbars=yes,resizable=yes,menubar=no,align=center,height=800,width=850'); break;
case 36:  window.open('http://www.ntutc.com/consoles/cn_6.jpg',"",'scrollbars=yes,resizable=yes,menubar=no,align=center,height=800,width=850'); break;

case 41:  window.open('http://www.ntutc.com/consoles/co_1.jpg',"",'scrollbars=yes,resizable=yes,menubar=no,align=center,height=800,width=850'); break;
case 42:  window.open('http://www.ntutc.com/consoles/co_2.jpg',"",'scrollbars=yes,resizable=yes,menubar=no,align=center,height=800,width=850'); break;
case 43:  window.open('http://www.ntutc.com/consoles/co_3.jpg',"",'scrollbars=yes,resizable=yes,menubar=no,align=center,height=800,width=850'); break;
}
}