function redirectTo(varName, n)
{
	var arg=location.search.substring(1).split('&');
	var strSearch = "";
	for(i = 0; i < arg.length; i++){
		if(arg[i].split('=')[0] != "" && arg[i].split('=')[0] != varName){
			strSearch = strSearch + arg[i] + "&";
		}
	}
	window.location.href = "./" + "?" + strSearch + varName + "=" + n;
}


function getVariable(varName)
{
	var arg = location.search.substring(1).split('&');
	var variable = "";
	var i;
	for(i = 0; i < arg.length; i++){
		if(arg[i].split('=')[0] == varName){
			if(arg[i].split('=').length > 1){
				variable=arg[i].split('=')[1];
			}
			return variable;
		}
	}
	return "";
}


function selOp(varName, def)
{
	n = getVariable(varName);
	n = (n == "") ? def : n;
	
	if (n == 24){
		document.getElementById('itm10').selected = true;
		document.getElementById('itm20').selected = false;
		document.getElementById('itm30').selected = false;
	}

	if (n == 48){
		document.getElementById('itm10').selected = false;
		document.getElementById('itm20').selected = true;
		document.getElementById('itm30').selected = false;
	}

	if (n == 72){
		document.getElementById('itm10').selected = false;
		document.getElementById('itm20').selected = false;
		document.getElementById('itm30').selected = true;
	}
}