replace useage of OpenLayers.Util.setOpacity() with OpenLayers.Util.modifyDOMElement(). Rewrite the former to use the latter, and mark the former as deprecated.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@1551 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Util.js

@@ -134,6 +134,9 @@ OpenLayers.Util.createImage = function(id, px, sz, imgURL, position, border,
 };
 
 /**
+ * @deprecated -- Use OpenLayers.Util.modifyDOMElement() or 
+ *                    OpenLayers.Util.modifyAlphaImageDiv()
+ * 
  * Set the opacity of a DOM Element
  * Note that for this function to work in IE, elements must "have layout"
  * according to:
@@ -143,8 +146,8 @@ OpenLayers.Util.createImage = function(id, px, sz, imgURL, position, border,
  * @param {Float} opacity Opacity value (0.0 - 1.0)
  */
 OpenLayers.Util.setOpacity = function(element, opacity) {
-    element.style.opacity = opacity;
-    element.style.filter = 'alpha(opacity=' + (opacity * 100) + ')';
+    OpenLayers.Util.modifyDOMElement(element, null, null, null,
+                                     null, null, null, opacity);
 }
 
 OpenLayers.Util.onImageLoad = function() {