Map sensors not refreshing

We have created a map that monitors the CPU and Network traffic on our exchange severs. We use the HTML after field and copied our script. The table comes up abut we are not able to get the table to refresh. We are able to click on the refresh button on the browser but it should auto refresh every 30 or 60 seconds.

<table style="width:100%;">
	<tr style="font-size=12;">
		<th style="font-size:350%;">Server</th>
		<th style="font-size:350%;">CPU Usage</th>
		<th style="font-size:350%;">Network Usage</th>
	</tr>
	<tr>
		<td style="font-size:250%;">PRDEXCH1</td>
		<td>
			<a href="https://prtg/sensor.htm?id=4466&tabid=1"><img style="width:950px;height:300px;" src="https://prtg/chart.png?type=graph&graphid=0&graphtitle=%40%40notitle%40%40&width=925&height=300&bgcolor=%23f3f2f2&graphstylefile=graphstyling.htm&animationandinteraction=1&datastylefile=graphdatastyling.htm&animationstylefile=graphanimationstyling.htm&graphstyling=baseFontSize%3D%2710%27%20showLegend%3D%270%27&tooltexts=1&datastyling=drawAnchors%3D%271%27%20anchorRadius%3D%271%27%20lineThickness%3D%272%27&refreshable=true&columns=datetime%2Cvalue_%2Ccoverage&_=1551375552009&myid=02861609&hide=NaN&id=4466" alt="PRDEXCH1 CPU"></a>
		</td>
		<td>
			<a href="https://prtg/sensor.htm?id=5042&tabid=1"><img style="width:950px;height:300px;" src="https://prtg/chart.png?type=graph&graphid=0&graphtitle=%40%40notitle%40%40&width=925&height=300&bgcolor=%23f3f2f2&graphstylefile=graphstyling.htm&animationandinteraction=1&datastylefile=graphdatastyling.htm&animationstylefile=graphanimationstyling.htm&graphstyling=baseFontSize%3D%2710%27%20showLegend%3D%270%27&tooltexts=1&datastyling=drawAnchors%3D%271%27%20anchorRadius%3D%271%27%20lineThickness%3D%272%27&refreshable=true&columns=datetime%2Cvalue_%2Ccoverage&_=1551376324023&id=5042&myid=1551377438944638825&hide=" alt="PRDEXCH1 Network"></a>
		</td>
	</tr>
	<tr>
		<td style="font-size:250%;">PRDEXCH2</td>
		<td>
			<a href="https://prtg/sensor.htm?id=5027&tabid=1"><img style="width:950px;height:300px;" src="https://prtg/chart.png?type=graph&graphid=0&graphtitle=%40%40notitle%40%40&width=925&height=300&bgcolor=%23f3f2f2&graphstylefile=graphstyling.htm&animationandinteraction=1&datastylefile=graphdatastyling.htm&animationstylefile=graphanimationstyling.htm&graphstyling=baseFontSize%3D%2710%27%20showLegend%3D%270%27&tooltexts=1&datastyling=drawAnchors%3D%271%27%20anchorRadius%3D%271%27%20lineThickness%3D%272%27&refreshable=true&columns=datetime%2Cvalue_%2Ccoverage&_=1551376324155&myid=01120595&id=5027" alt="PRDEXCH2 CPU"></a>
		</td>
		<td>
			<a href="https://prtg/sensor.htm?id=5045&tabid=1"><img style="width:950px;height:300px;" src="https://prtg/chart.png?type=graph&graphid=0&graphtitle=%40%40notitle%40%40&width=925&height=300&bgcolor=%23f3f2f2&graphstylefile=graphstyling.htm&animationandinteraction=1&datastylefile=graphdatastyling.htm&animationstylefile=graphanimationstyling.htm&graphstyling=baseFontSize%3D%2710%27%20showLegend%3D%270%27&tooltexts=1&datastyling=drawAnchors%3D%271%27%20anchorRadius%3D%271%27%20lineThickness%3D%272%27&refreshable=true&columns=datetime%2Cvalue_%2Ccoverage&_=1551376324187&id=5045&myid=15513779587231158611&hide=" alt="PRDEXCH2 Network"></a>
		</td>
	</tr>
	<tr>
		<td style="font-size:250%;">PRDEXCH3</td>
		<td>
			<a href="https://prtg/sensor.htm?id=4507&tabid=1"><img style="width:950px;height:300px;" src="https://prtg/chart.png?type=graph&graphid=0&graphtitle=%40%40notitle%40%40&width=925&height=300&bgcolor=%23f3f2f2&graphstylefile=graphstyling.htm&animationandinteraction=1&datastylefile=graphdatastyling.htm&animationstylefile=graphanimationstyling.htm&graphstyling=baseFontSize%3D%2710%27%20showLegend%3D%270%27&tooltexts=1&datastyling=drawAnchors%3D%271%27%20anchorRadius%3D%271%27%20lineThickness%3D%272%27&refreshable=true&columns=datetime%2Cvalue_%2Ccoverage&_=1551376324213&id=4507&myid=15513779839011183721&hide=" alt="PRDEXCH3 CPU"></a>
		</td>
		<td>
			<a href="https://prtg/sensor.htm?id=5044&tabid=1"><img style="width:950px;height:300px;" src="https://prtg/chart.png?type=graph&graphid=0&graphtitle=%40%40notitle%40%40&width=925&height=300&bgcolor=%23f3f2f2&graphstylefile=graphstyling.htm&animationandinteraction=1&datastylefile=graphdatastyling.htm&animationstylefile=graphanimationstyling.htm&graphstyling=baseFontSize%3D%2710%27%20showLegend%3D%270%27&tooltexts=1&datastyling=drawAnchors%3D%271%27%20anchorRadius%3D%271%27%20lineThickness%3D%272%27&refreshable=true&columns=datetime%2Cvalue_%2Ccoverage&_=1551376324240&id=5044&myid=15513780081941208081&hide=" alt="PRDEXCH3 Network"></a>
		</td>
	</tr>
	<tr>
		<td style="font-size:250%;">PRDEXCH4</td>
		<td>
			<a href="https://prtg/sensor.htm?id=5031&tabid=1"><img style="width:950px;height:300px;" src="https://prtg/chart.png?type=graph&graphid=0&graphtitle=%40%40notitle%40%40&width=925&height=300&bgcolor=%23f3f2f2&graphstylefile=graphstyling.htm&animationandinteraction=1&datastylefile=graphdatastyling.htm&animationstylefile=graphanimationstyling.htm&graphstyling=baseFontSize%3D%2710%27%20showLegend%3D%270%27&tooltexts=1&datastyling=drawAnchors%3D%271%27%20anchorRadius%3D%271%27%20lineThickness%3D%272%27&refreshable=true&columns=datetime%2Cvalue_%2Ccoverage&_=1551376324266&id=5031&myid=15513780374601237268&hide=" alt="PRDEXCH4 CPU"></a>
		</td>
		<td>
			<a href="https://prtg/sensor.htm?id=5043&tabid=1"><img style="width:950px;height:300px;" src="https://prtg/chart.png?type=graph&graphid=0&graphtitle=%40%40notitle%40%40&width=925&height=300&bgcolor=%23f3f2f2&graphstylefile=graphstyling.htm&animationandinteraction=1&datastylefile=graphdatastyling.htm&animationstylefile=graphanimationstyling.htm&graphstyling=baseFontSize%3D%2710%27%20showLegend%3D%270%27&tooltexts=1&datastyling=drawAnchors%3D%271%27%20anchorRadius%3D%271%27%20lineThickness%3D%272%27&refreshable=true&columns=datetime%2Cvalue_%2Ccoverage&_=1551376324293&id=5043&myid=15513780603291260191&hide=" alt="PRDEXCH4 Network"></a>
		</td>
	</tr>
</table>

autorefresh exchange html