add old website sds v4

content/files/old/sds_v4/scripts/alpha.js

@@ -0,0 +1,39 @@
+/*
+Gradual-Highlight Image Script II- 
+By J. Mark Birenbaum (birenbau@ugrad.cs.ualberta.ca)
+Permission granted to Dynamicdrive.com to feature script in archive
+For full source to script, visit http://dynamicdrive.com
+*/
+
+nereidFadeObjects = new Object();
+nereidFadeTimers = new Object();
+
+/* object - image to be faded (actual object, not name);
+ * destop - destination transparency level (ie 80, for mostly solid)
+ * rate   - time in milliseconds between trasparency changes (best under 100)
+ * delta  - amount of change each time (ie 5, for 5% change in transparency)
+ */
+
+function nereidFade(object, destOp, rate, delta){
+if (!document.all)
+return
+    if (object != "[object]"){  //do this so I can take a string too
+        setTimeout("nereidFade("+object+","+destOp+","+rate+","+delta+")",0);
+        return;
+    }
+        
+    clearTimeout(nereidFadeTimers[object.sourceIndex]);
+    
+    diff = destOp-object.filters.alpha.opacity;
+    direction = 1;
+    if (object.filters.alpha.opacity > destOp){
+        direction = -1;
+    }
+    delta=Math.min(direction*diff,delta);
+    object.filters.alpha.opacity+=direction*delta;
+
+    if (object.filters.alpha.opacity != destOp){
+        nereidFadeObjects[object.sourceIndex]=object;
+        nereidFadeTimers[object.sourceIndex]=setTimeout("nereidFade(nereidFadeObjects["+object.sourceIndex+"],"+destOp+","+rate+","+delta+")",rate);
+    }
+}