var USER_AGENT = navigator.userAgent.toLowerCase();

isWIN = ( USER_AGENT.indexOf("win") != -1 ) ? true : false;
isMAC = ( USER_AGENT.indexOf("mac") != -1 ) ? true : false;
isNS4 = (document.layers) ? true : false;
isIE4 = (document.all && !document.getElementById) ? true : false;
isIE5 = (document.all && document.getElementById) ? true : false;
isIE6 = ( USER_AGENT.indexOf("msie 6.0") != -1 ) ? true : false;
isIE7 = ( USER_AGENT.indexOf("msie 7.0") != -1 ) ? true : false;
isIE8 = ( USER_AGENT.indexOf("msie 8.0") != -1 ) ? true : false;
isNS6 = (!document.all && document.getElementById) ? true : false;
isOPE = ((USER_AGENT.indexOf("opera") != -1) && document.documentElement) ? true:false; 

function getObj(idname) {
	if (isNS4){
		elm = document.layers[idname];
	}
	else if (isIE4) {
		elm = document.all[idname];
	}
	else if (isIE5 || isNS6) {
		elm = document.getElementById(idname);
	}
	return elm;
}

function addPhotoDiaryField(first,max) {
	var addField = getObj('addDiaryField');
	var elements = document.getElementsByTagName("div");
	var num = 0;
	for(i=0;i<elements.length;i++){
		if (elements[i].id == 'addDiaryField'){
			num++;
		}
	}

	if (num + first <= max){
		var n = first + num;
		var s = '画像 ' + n + ':<br><div id="addDiaryField" style="padding:4px 3px;">';
		s += '<input type="file" name="upfile[]" size="70" ><br>';
		s += '<img src="./skin/dummy.gif" alt="dot" class="dot"><br>';
		s += '<textarea class="text" name="body[]" rows="3" cols="50" style="width:415px"></textarea><br><br>';
		s += '</div>';
	
		var div	= document.createElement('div');
		addField.appendChild(div);
		div.innerHTML = s;
	}
}

function switchElementDisplay(name) {
	var el = document.getElementById(name);
	if (el.style.display == 'block'){
		el.style.display = 'none';
	}else{
		el.style.display = 'block';
	}
}