diff --git a/ui/jsp/iso.jsp b/ui/jsp/iso.jsp
index b4d9c852247..436aa94c9ab 100644
--- a/ui/jsp/iso.jsp
+++ b/ui/jsp/iso.jsp
@@ -299,7 +299,14 @@
                     <label><%=t.t("disk.offering")%>:</label>
                     <select class="select" id="disk_offering">
                     </select>
-                </li>	
+                </li>
+                <li id="size_container">
+                    <label>
+                        <%=t.t("size")%>:</label>
+                    <input class="text" type="text" id="size" />
+                    <div id="size_errormsg" class="dialog_formcontent_errormsg" style="display: none;">
+                    </div>
+                </li>    		
                 <li>
                     <label><%=t.t("hypervisor")%>:</label>
                     <select class="select" id="hypervisor">
diff --git a/ui/scripts/cloud.core.iso.js b/ui/scripts/cloud.core.iso.js
index 4f42b9312b5..b05d1f0a0ad 100644
--- a/ui/scripts/cloud.core.iso.js
+++ b/ui/scripts/cloud.core.iso.js
@@ -154,13 +154,28 @@ function afterLoadIsoJSP() {
 	        var items = json.listdiskofferingsresponse.diskoffering;
 	        if(items != null && items.length > 0 ) {
 	            var diskOfferingField = $("#dialog_create_vm_from_iso #disk_offering").empty();
-	            for(var i = 0; i < items.length; i++)		        
-	                diskOfferingField.append("<option value='" + items[i].id + "'>" + fromdb(items[i].name) + "</option>");
+	            for(var i = 0; i < items.length; i++) {		  
+	                var $option = $("<option value='" + items[i].id + "'>" + fromdb(items[i].name) + "</option>");	
+		            $option.data("jsonObj", items[i]);			                              
+	                diskOfferingField.append($option);	            
+	            }
+	            $("#dialog_create_vm_from_iso").find("#disk_offering").change();
 	        }		  
 	        
 	    }
 	});		
     
+    $("#dialog_create_vm_from_iso").find("#disk_offering").bind("change", function(event) {  	         
+        var jsonObj = $(this).find("option:selected").data("jsonObj");
+        if(jsonObj != null && jsonObj.isCustomized == true) { //jsonObj is null when "<option value=''>No disk offering</option>" is selected
+            $("#dialog_create_vm_from_iso").find("#size_container").show();
+        }
+        else {
+            $("#dialog_create_vm_from_iso").find("#size_container").hide();  
+            $("#dialog_create_vm_from_iso").find("#size").val("");
+        }      
+    });
+    
     //initialize dialog box ***
     initDialog("dialog_confirmation_delete_iso_all_zones");
     initDialog("dialog_confirmation_delete_iso");
@@ -498,20 +513,33 @@ function doCreateVMFromIso($actionLink, $detailsTab, $midmenuItem1) {
 	        // validate values
 		    var isValid = true;		
 		    isValid &= validateString("Name", thisDialog.find("#name"), thisDialog.find("#name_errormsg"), true);
-		    isValid &= validateString("Group", thisDialog.find("#group"), thisDialog.find("#group_errormsg"), true);				
-		    if (!isValid) return;	       
+		    isValid &= validateString("Group", thisDialog.find("#group"), thisDialog.find("#group_errormsg"), true);	
+		     if(thisDialog.find("#size_container").css("display") != "none")
+			    isValid &= validateNumber("Size", thisDialog.find("#size"), thisDialog.find("#size_errormsg"));				
+		    if (!isValid) 
+		        return;	       
 	           
 	        thisDialog.dialog("close");   
 	        
 	        var array1 = [];
+	        
 	        var name = trim(thisDialog.find("#name").val());
 	        array1.push("&displayname="+todb(name));		
+	        
 	        var group = trim(thisDialog.find("#group").val());	
 	        array1.push("&group="+todb(group));	
+	        
 	        var serviceOfferingId = thisDialog.find("#service_offering").val();	
 	        array1.push("&serviceOfferingId="+serviceOfferingId);			        
+	        
 	        var diskOfferingId = thisDialog.find("#disk_offering").val();	
 	        array1.push("&diskOfferingId="+diskOfferingId);
+	        
+	        if(thisDialog.find("#size_container").css("display") != "none") {
+	            var size = thisDialog.find("#size").val()
+			    array1.push("&size="+size);
+	        }
+	        
 	        var hypervisor = thisDialog.find("#hypervisor").val();	
 	        array1.push("&hypervisor="+hypervisor);