Hi, I want that user must add an Image (With the "Image Tab" from the Editor). Does somebody know what code I have to put in there? herese the section from the itemform.php document

Joomla.submitbutton = function(pressbutton){
if (pressbutton == 'cancel') {
submitform( pressbutton );
return;
}
if (\$K2.trim(\$K2('#title').val()) == '') {
alert( '".JText::_('K2_ITEM_MUST_HAVE_A_TITLE', true)."' );
}
else if (\$K2.trim(\$K2('#catid').val()) == '0') {
alert( '".JText::_('K2_PLEASE_SELECT_A_CATEGORY', true)."' );
}
else {
syncExtraFieldsEditor();
\$K2('#selectedTags option').attr('selected', 'selected');
submitform( pressbutton );
}
}

This would be a great option, hope you figure this out I would also like to do this.