How to re size the image viewer?

[Gauravk]

While making a simple classifieds with the help of IP Content long ago, someone helped here to load images in a viewer with below codes, I like to resize that to 800x600 size, is it possible....?

Images field - > Images Display option - > Custom

<br><div class="ipsClearfix">
{{foreach $value as $image}}
  <a href='{file="$image" extension="cms_Records"}' class='ipsAttachLink ipsAttachLink_image' rel='external nofollow' target='_blank' data-ipslightbox='' data-ipslightbox-group="g1">
  <img style="height:120px" hspace="5" vspace="5" src='{file="$image" extension="cms_Records"}'>
  </a>
{{endforeach}}
</div><br>