dhtmlxcombo on secure site with https

I get IE Security Information alert box (“This page contains both secure and non secure items. Do you want to display the non secure item?”) when using dhtmlxcombo on a secure website. IE pops up the alert message everytime I go a page which has the dhtmlxcombo implemented. In a non secure (http) website it is fine. Can you tell me how to fix it?

It seems that you are using old code, such problem really was exist in old version, but fixed in latest one.
If problem occurs for you with latest version of code ( dhtmlxCombo v1.1 build 71022, which can be downloaded from dhtmlx.com ) - please provide any kind of sample where problem can be reconstructed.
( please be sure to use correct path to images directory, because if it missed, or incorrect - the mentioned problem will occur )