// JavaScript to toggle the navigation and content
function switchContent(num){
	switch(num){
	    case 1:
		//switch page navs
		document.getElementById('nav1').style.display = "block";
        document.getElementById('nav2').style.display = "none";
		document.getElementById('nav3').style.display = "none";
		document.getElementById('nav4').style.display = "none";
		//
		//switch content
		document.getElementById('content1').style.display = "block";
        document.getElementById('content2').style.display = "none";
		document.getElementById('content3').style.display = "none";
		document.getElementById('content4').style.display = "none";
		//
		//switch header
		document.getElementById('instance1').style.display = "block";
        document.getElementById('instance2').style.display = "none";
		document.getElementById('instance3').style.display = "none";
		document.getElementById('instance4').style.display = "none";
		//switch terms
		document.getElementById('terms1').style.display = "block";
        document.getElementById('terms2').style.display = "none";
        document.getElementById('terms3').style.display = "none";
        document.getElementById('terms4').style.display = "none";
		//
		break;
        case 2:
		//switch page navs
		document.getElementById('nav1').style.display = "none";
        document.getElementById('nav2').style.display = "block";
		document.getElementById('nav3').style.display = "none";
		document.getElementById('nav4').style.display = "none";
		//
		//switch content
		document.getElementById('content1').style.display = "none";
        document.getElementById('content2').style.display = "block";
		document.getElementById('content3').style.display = "none";
		document.getElementById('content4').style.display = "none";
		//switch header
		document.getElementById('instance1').style.display = "none";
        document.getElementById('instance2').style.display = "block";
		document.getElementById('instance3').style.display = "none";
		document.getElementById('instance4').style.display = "none";
		//switch terms
		document.getElementById('terms1').style.display = "none";
        document.getElementById('terms2').style.display = "block";
        document.getElementById('terms3').style.display = "none";
        document.getElementById('terms4').style.display = "none"
		//
		break;
	    case 3:
		//switch page navs
		document.getElementById('nav1').style.display = "none";
        document.getElementById('nav2').style.display = "none";
		document.getElementById('nav3').style.display = "block";
		document.getElementById('nav4').style.display = "none";
		//
		//switch content
		document.getElementById('content1').style.display = "none";
        document.getElementById('content2').style.display = "none";
		document.getElementById('content3').style.display = "block";
		document.getElementById('content4').style.display = "none";
		//
		//switch header
		document.getElementById('instance1').style.display = "none";
        document.getElementById('instance2').style.display = "none";
		document.getElementById('instance3').style.display = "block";
		document.getElementById('instance4').style.display = "none";
		//switch terms
		document.getElementById('terms1').style.display = "none";
        document.getElementById('terms2').style.display = "none";
        document.getElementById('terms3').style.display = "block";
        document.getElementById('terms4').style.display = "none";
		//
		break;
		 case 4:
		//switch page navs
		document.getElementById('nav1').style.display = "none";
        document.getElementById('nav2').style.display = "none";
		document.getElementById('nav3').style.display = "none";
		document.getElementById('nav4').style.display = "block";
		//
		//switch content
		document.getElementById('content1').style.display = "none";
        document.getElementById('content2').style.display = "none";
		document.getElementById('content3').style.display = "none";
		document.getElementById('content4').style.display = "block";
		//
		//switch header
		document.getElementById('instance1').style.display = "none";
        document.getElementById('instance2').style.display = "none";
		document.getElementById('instance3').style.display = "none";
		document.getElementById('instance4').style.display = "block";
		//switch terms
		document.getElementById('terms1').style.display = "none";
        document.getElementById('terms2').style.display = "none";
        document.getElementById('terms3').style.display = "none";
        document.getElementById('terms4').style.display = "block";
		//
		break;
		
	}
}
function queryString(parameter) { 
    var loc = location.search.substring(1, location.search.length);
    var param_value = false;

    var params = loc.split("&");
    for (i=0; i<params.length;i++) {
        param_name = params[i].substring(0,params[i].indexOf('='));
        if (param_name == parameter) {
            param_value = params[i].substring(params[i].indexOf('=')+1)
        }
    }
    if (param_value) {
        return param_value;
    }
    else {
        return false; 
    }
}