function check_num(a) {
	if (/[^0-9.]/g.test(a)) {
		return false;
	} else {
		return true;
	}
}

function isEmail(c) {
	var b = new RegExp("^[a-zA-Z0-9][a-zA-Z0-9@._-]{3,}[a-zA-Z]$");
	var a = new RegExp("[@.]{2}");
	if (c.search(b) == -1 || c.indexOf("@") == -1 || c.lastIndexOf(".") < c.lastIndexOf("@") || c.lastIndexOf("@") != c.indexOf("@") || c.search(a) != -1) {
		return false;
	}
	return true;
}

function Checker(a) {
	document.form1.items.value = "";
	if (a == "all") {
		if (!document.form1.item.length) {
			if (document.form1.allitems.checked == true) {
				document.form1.item.checked = true;
				document.form1.items.value = document.form1.item.value;
			} else {
				document.form1.item.checked = false;
			}
		} else {
			if (document.form1.allitems.checked == true) {
				for (i = 0; i < document.form1.item.length; i++) {
					document.form1.item[i].checked = true;
					document.form1.items.value += document.form1.item[i].value;
					document.form1.items.value += ",";
				}
			} else {
				for (i = 0; i < document.form1.item.length; i++) {
					document.form1.item[i].checked = false;
				}
			}
		}
	} else {
		if (!document.form1.item.length) {
			if (document.form1.item.checked == true) {
				document.form1.items.value = document.form1.item.value;
			}
		} else {
			for (i = 0; i < document.form1.item.length; i++) {
				if (document.form1.item[i].checked == true) {
					document.form1.items.value += document.form1.item[i].value;
					document.form1.items.value += ",";
				}
			}
		}
	}
	return true;
}

function chcontent(a) {
	if (a == "show") {
		document.getElementById("content").style.display = "block";
	} else {
		document.getElementById("content").style.display = "none";
	}
}

function chcontentsell(a) {
	if (a == "show") {
		document.getElementById("content_sell").style.display = "block";
	} else {
		document.getElementById("content_sell").style.display = "none";
	}
}

function showdiv(b, a) {
	if (a == "show") {
		document.getElementById(b).style.display = "block";
	} else {
		document.getElementById(b).style.display = "none";
	}
}