function cParam(address, nparam, pageno) {
/*
address=URL fullname&param   ex. http://127.0.0.1/content.php?a=1
nparam=param_name ex. a
pageno=value for param_name ex. 1
*/
	var url = address;
	if (url.indexOf(nparam) >= 0) {
		var rexp = "\\b"+nparam+"=[0-9]+\\b";
		var re = new RegExp(rexp, "g");
		var url = url.replace(re, nparam+"="+pageno);
	} else {
		if (url.indexOf("?") >= 0) {
			if (url.indexOf("&") >= 0) 
				url = url + nparam + "=" + pageno;
			else 
				url = url + "&" + nparam + "=" + pageno;
		} else 
			url = url + "?" + nparam + "=" + pageno;
	}
	return url;
}

function toggleDiv(showDiv, hideDiv) {	
	document.getElementById(showDiv).style.display = 'block';
	document.getElementById(hideDiv).style.display = 'none';
}