var first = 'ma';
var second = 'il';
var third = 'to:';
var address = 'isoaho';
var domain = 'isoaho.kpnet';
var ext = 'com'; 
	document.write('<a href="');
	document.write(first+second+third);
	document.write(address);
	document.write('@');
	document.write(domain);
	document.write('.');
	document.write(ext);  
	document.write('">'); 
	document.write(address);
	document.write('@');
	document.write(domain);
	document.write('.');
	document.write(ext);
	document.write('</a>');