// JavaScript Document
function checkspace(checkstr) {
	var str = '';
	for(i = 0; i < checkstr.length; i++) {
		str = str + ' ';
	}
	return (str == checkstr);
}

function IsDigit(){
	return ((event.keyCode >= 48) && (event.keyCode <= 57));
}

function sel_checkbox() {
	var a = document.getElementsByTagName("input");
	for (var i=0; i<a.length; i++) {
		if (a[i].type == "checkbox") {
			if (a[i].checked) {
				a[i].checked = false;
			}
			else {
				a[i].checked = true;
			}
		}
	}
}