Image Stretch in Internet Explorer

I was working on one of the themes , which had the following structure :

content this was a good option but again I found it less efficient, as it would render my class1 limited
2. Put a height tag of 1%, IE is notorious in that field --> tried but not worked

3. Put a font-size: 1px; WORKING !!!!

in the class , class 2, just add a new tag
.class 2 , .class 4 { font-size: 1px}

and it worked wonders as if nothing was wrong ever. IE 7+ is happy now.

Final Word : In case you are looking for IE 6 fix, then possibly solution 1 will be helpful.