increasing /var

i need to increase the size of my /var filesystem but i have no idea how to do it.

Filesystem kbytes used avail capacity Mounted on
/dev/dsk/c0t3d0s0 144799 74952 55377 58% /
/dev/dsk/c0t3d0s6 342183 201079 106894 66% /usr
/proc 0 0 0 0% /proc
fd 0 0 0 0% /dev/fd
/dev/dsk/c0t3d0s4 308647 203402 74385 74% /var
/dev/dsk/c0t2d0s4 384871 419 345972 1% /data
/dev/dsk/c0t2d0s5 384871 280051 66340 81% /export/home
/dev/dsk/c0t5d0s1 3945485 802594 2748351 23% /opt
/dev/dsk/c0t1d0s7 1278846 1 1150965 1% /sybase10
/dev/dsk/c0t5d0s5 1972734 1 1775463 1% /sybase11
/dev/dsk/c0t3d0s7 663039 1 596738 1% /tftpboot
swap 608584 236 608348 1% /tmp

can anyone help me????