JPEG Batch conversions help plz for online lab

[froggiestyle]

I really get irritated quickly with this process of trying to figure out proper size/resolution when uploading pics to online photolabs!
I took the pics in 10M on the camera, i dont know why but changed them all to 400x(whatever the computer changed it to), for easy email purposes
Now I thought I would upload the pics and print at an online lab and everything is off resolution!
Should I start back from teh begining where the pictures are 10M, lab wants them 1M (700x1000)
if so...how do I batch convert them? can you recommend an easy program? i use irfanview but am confused on batch conversions on that....omg please help before lose my mind.....
Thanks and hope you have a good nite!

[MaxxMan]

Here's a guide that walks you through the steps of batch conversion with irfanview http://www.bleepingcomputer.com/forums/topic50519.html There's also a video walk through Batch Conversion Video. I would suggest trying your settings with 5 files until you get things the way. Good luck.