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<!-- map -->
<div style="TOP:160px;LEFT:5px;position:absolute;Z-index:0">
<img border="0" src="derwent.png" width="503" height="578" usemap="#clickmap">
</div\>

<!-- icons -->
<div style="TOP:467px;LEFT:427px;position:absolute;Z-index:1">
<a href="BOYNTN1/forecastlocation.html"><img border="0" src="fluvial_site_data.gif"
title="Boyntn1: No threshold exceeded"></a>
</div>

The z-index of a icon is determined by the severity of the thresholdWarningLevel that has been crossed, meaning that the locations with the highest crossed thresholdWarningLevel will always be visible (and not potentially hidden behind other icons). Also, future/predicted crossings have a higher z-index then past/observed crossings. The exact Z index for a historical crossing is equal to the severity level. For a forecast crossing it's equal to the maximum configured severity level plus the severity level.

The overlayFormat element can also contain location attribute ids, e.g. " (BASIN)", where tags between "@" signs refer to location attributes that are defined in the locationSets config file. These tags will be replaced with the corresponding attribute values for each location. These values can be different for different locations. See 22 Locations and attributes defined in CSV files, Shape-DBF files or external tables for more information. If required to use a "@" sign in this element without using locationAttributes, then need to add an extra escape character "@" before each "@" sign. In other words "@@" is replaced with a single "@" sign.

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