maybe you could just send a link to the page?
using the persons default email it is quite easy (i think).
this kind of code:
window.location = "mailto:" + emailAddress + "&subject='come to this page'&body='" + window.location + "'"
you have to define the variable emailAddress (eg from a form). all this does is send an email with a link to the current page - maybe not what you're looking for. if you need to actually send the html content of a page in the email, you will probably need a server-side language. but this idea would work as a minimum.
lots of websites do have an 'email this page' form, i'll try to find out how this works.