if you want to use pure html check out this topic,
http://www.scriptingok.com/forum/viewtopic.php?f=5&t=880this is how i would do it with javascript
<script type="text/javascript">
var a=new Array();
function printtheform(){
for(i=0;i<document.forms[0].length;i++)
{a[i]=document.forms[0].elements[i].value;
document.forms[0].elements[i].value='';}
print();
alert('click ok after page is printed to restore the values');
for(i=0;i<document.forms[0].length;i++)
{document.forms[0].elements[i].value=a[i];
a[i]='';}}
</script>