If all you want is to use the php variable to draw the chart on page load,
your code should look something like this:
function drawGauge() {
var data = new google.visualization.DataTable();
data.addColumn("string", "foo");
data.addColumn("number", "bar");
data.addRow();
data.setValue(0, 0,"foobar");
data.setValue(0, 1,<?php echo $Curr; ?>);
var gauge = new
google.visualization.Gauge(document.getElementById("gauge_div"));
gauge.draw(data, {<options>});
}
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