Background Removal - II

I tried the lasso tool on picture with sharp edges but i have another image which does not have sharp edges, so what should i do for that image. I just want the background to be transparent. Can anybody help me in that in Paintshop Pro 7 or PhotoShop 7. I have used Pen tool but it requires quality finishing. Any other way, i can turn the background to transparent.
Best Regards,
Sam.