Index: lams_central/web/includes/javascript/dialog.js
===================================================================
diff -u -rc1cee2dfecd4ae06a924cf55b45fde48a8be09c9 -rc7a2736ea5ed8e5991794aa6530d5a45caec9f43
--- lams_central/web/includes/javascript/dialog.js	(.../dialog.js)	(revision c1cee2dfecd4ae06a924cf55b45fde48a8be09c9)
+++ lams_central/web/includes/javascript/dialog.js	(.../dialog.js)	(revision c7a2736ea5ed8e5991794aa6530d5a45caec9f43)
@@ -243,6 +243,8 @@
 	            if (draggable) {
 	            	modalDialog.draggable('disable');
 	            }
+	            //enable scrolling of the parent's content
+	            dialog.parent().removeClass("modal-open");		        	
 	        };
 	    });
 	    
@@ -270,6 +272,8 @@
     	var modalDialog = $('.modal-dialog', dialog);
     	modalDialog.draggable('enable');
     }
+    //disable scrolling of the parent's content
+    dialog.parent().addClass("modal-open");
 }
 
 /**