This code reduses the size of the images in forum to the wanted size u will chose
Just put the code randomly in the css and then it shouldwork
Code
.posttdMessage img {max-width: 700px; max-height: 500px; size: auto;}
for blogs , file catologs etc..
Code
.eMessage img {max-width: 700px; max-height: 500px; size: auto;}