function showhide(system, obj) {
	var cur = document.getElementById(system).style;
	if (cur.display == "block") {
		cur.display = "none";
	} else {
		cur.display = "block";	
	}
	return true;
}

function isNum(str){
	for (var i = 0; i < str.length; i++) {
		var ch = str[i];
		if ((ch < "0" || ch > "9") && ch != "." && ch != "+" && ch != "-" && ch != "e" && ch != "E") return false;
    }
	return true;
}

function setFocus(name){
	var focusField=document.getElementById(name);
	focusField.focus();
}