var prefix = 'ma' + 'il' + 'to'; 
var path = 'hr' + 'ef' + '='; 
var addy83012 = 'kontakt' + '@'; 
addy83012 = addy83012 + 'detoagency' + '.' + 'eu'; 
document.write( '<a ' + path + '\'' + prefix + ':' + addy83012 + '\'>' ); 
document.write( addy83012 ); 
document.write( '<\/a>' );