add indexOf() function to array - returns first index of a given element in an array. useful for testing, etc

git-svn-id: http://svn.openlayers.org/trunk/openlayers@225 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

tests/test_Util.html

@@ -23,7 +23,7 @@
     }
 
     function test_03_Util_Array(t) {
-        t.plan( 6 );
+        t.plan( 8 );
 
         var array = new Array(1,2,3,4,5);
 
@@ -40,9 +40,15 @@
         t.eq( copy.toString(), "0,1,2,4,5,6", "array.copyOf() works");    
         array.append(7);
         t.eq( copy.toString(), "0,1,2,4,5,6", "changing a value in the copied array doesnt affect the new array");    
+
+        
+        t.eq( copy.indexOf(5), 4, "indexOf function returns index of value in an array");    
+        t.eq( copy.indexOf(75), -1, "indexOf function returns -1 when element not found in array");    
         
         array.clear();
         t.eq( array.toString(), "", "array.clear() works");    
+
+
     }
 
     function test_04_Util_createDiv(t) {