My chosen theme is no longer compaitble in IE 6,7….

I’ve made my first site in WordPress using a theme “Le Mag” which I thought was simple enough, one reason for using it was the simplicity and the cross platform compatibility (Compatible with WordPress 2.7 and valid CSS & HTML. (IE6-IE7-IE8-Firefox same-looked design) )

The site seems to work… but now I’m getting reports that it doesn’t work in older IE7… it must be something I’ve done to the theme, but I’ve no idea what – can anyone help please?

the site is here: https://www.keynshammusicfestival.co.uk

thanks