You would be removing this code to get the window from not popping up initially:
if('address_0_<?php echo $getListing_id; ?>' == 'address_0_0')
marker_0_<?php echo $getListing_id; ?>.openInfoWindowHtml(address_0_<?php echo $getListing_id; ?>.infowindowtext);
And this is the code that you would use for changing the mouseover:
GEvent.addListener(marker_0_<?php echo $getListing_id; ?>, 'click', function() {
marker_0_<?php echo $getListing_id; ?>.openInfoWindowHtml(address_0_<?php echo $getListing_id; ?>.infowindowtext);
});
Change the click to mouseover:
GEvent.addListener(marker_0_<?php echo $getListing_id; ?>, 'mouseover', function() {
marker_0_<?php echo $getListing_id; ?>.openInfoWindowHtml(address_0_<?php echo $getListing_id; ?>.infowindowtext);
});
To add the mouseout:
GEvent.addListener(marker_0_<?php echo $getListing_id; ?>, 'mouseout', function() {
marker_0_<?php echo $getListing_id; ?>.closeInfoWindow();
});