var max = 7;								//topimage○.jpg　の末尾（最大1-9）
var host = "http://www.naturegame.or.jp/";			//indexディレクトリ


//-- send mail -----------------------------------------------------------------//

function send_mail(add1,add2,sub)
{
	var add = link = add1 + '@' + add2;
	if( sub != "" ) { link += '?subject=' + sub; }
	
	document.write ("<a href='mailto:" + link + "'>" + add + "</a>");
}

//-- send forms -----------------------------------------------------------------//

function send_forms(add1,add2,add3,add4)
{
	var add = link = add1 + '&#64;' + add2;
	if( add3 != "" && add4 != "" ) { link += ',' + add3 + '&#64;' + add4; }
	
	document.write ("<input type='hidden' name='myaddress' value='" + link + "'>");
}

//-- random image --------------------------------------------------------------//

function topimg()
{
	var topimg = document.images['topimage'].src;
	var temp = topimg.match(/topimage\d/i) ;
	var num = 'topimage' + Math.ceil(Math.random() * max);
	
	topimg = topimg.replace(temp,num);
	document.images['topimage'].src = topimg;
}

//-- pull down/up --------------------------------------------------------------//

var over = "";

function pulldown(item1,item2)
{
	var img = document.images[item2].src;
	
	over = img.replace("_a","_b");
	document.images[item2].src = over;
	if( item1 != "" ) {
		document.getElementById(item1).style.display = 'block';
	}
}
function pullup(item1,item2)
{
	var img = document.images[item2].src;
	
	over = img.replace("_b","_a");
	document.images[item2].src = over;
	if( item1 != "" ) {
		document.getElementById(item1).style.display = 'none';
	}
}

function pulldown1(item)
{
	var img = document.images[item].src;
	
	over = img.replace("_a","_b");
	document.images[item].src = over;
}
function pullup1(item)
{
	var img = document.images[item].src;
	
	over = img.replace("_b","_a");
	document.images[item].src = over;
}


//-- mac style -----------------------------------------------------------------//

function Macstyle(id)
{
	var os = window.navigator.platform;
	var browse = window.navigator.userAgent;
	if ( os.match(/Mac/i) || browse.match(/Safari/i) )
	{
		var obj = document.all && document.all(id)
				|| document.getElementById && document.getElementById(id);
		
		if( obj && obj.style ) obj.style.fontSize = "13px";
	}
}


//-- roll over -----------------------------------------------------------------//

function Rollon(id)
{
	document.images[id].src = "img/"+id+".jpg";
	return;
}
function Rolloff(id)
{
	document.images[id].src = "img/clear.gif";
	return;
}

//-- copy right ----------------------------------------------------------------//

function WriteCopyright()
{
	today = new Date();
	thisyear = today.getYear();
	if( thisyear < 2000 ) { thisyear += 1900; }
	
	document.write ("<div id='copy'>Copyright 1997-" + thisyear + " JNGA. All rights reserved.</div>");
}

//-- page top ------------------------------------------------------------------//

function WritePtop()
{
	document.write ('<div class="ptop"><a href="#top"><img src="' + host + 'img/b_top.jpg" width="114" height="20" border="0"></a></div>');
}