Error 404 with the home page

I use joomla 1.5.23 and MobileJoomla 0.9.11. I did a button in the home page to switch the template but i link me to a wrong page, hoe can I fix it?
It'è the image of the iphone at the bottom of the page www.meccanicaweb.it

Thanks

Try to empty "return" parameter:
www.meccanicaweb.it/index2.php?option=com_mobilejoomla&task=setmarkup&markup=iphone&return=

thank you so much