var tx1 = 'info';
var tx2 = '@';
var tx3 = 'technolabo.com';

function writeMailHeader() {
	var txMail = tx1 + tx2 + tx3;
	document.write('<a id="bu_header_mail" href="mailto:' + txMail + '"><span>メール</span></a>');
}

function writeMailFooter() {
	var txMail = tx1 + tx2 + tx3;
	document.write('<a href="mailto:' + txMail + '">' + txMail + '</a>');
}

function writeMailOther(mtTx) {
	var txMail = tx1 + tx2 + tx3;
	document.write('<a href="mailto:' + txMail + '">' + mtTx + '</a>');
}