If you look at this site (http://www.aendekerk.be/beta); you'll probably see this (upper right corner):

This is how it should be:

Most of the time, the layout is correct. But not always. When i press refresh, the browser often corrects this. How can i fix this?
This is the code i use:
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with(aendekerk=new menuname("Main Menu")){
style=menuStyle;
top=155;
left=200;
alwaysvisible=1;
orientation="horizontal";
position="relative";
aI("text=Over ons bedrijf;url="+path+"bedrijf/index.html;showmenu=bedrijf;status=Alles over Aendekerk b.v.b.a;itemwidth=100;");
aI("text=Airconditioning;url="+path+"airco/index.html;showmenu=airco;status=Airconditioning;itemwidth=92;");
aI("text=Koel- en vriescellen;url="+path+"koelvriescel/index.html;showmenu=koelvriescel;status=Koel- en vriescellen;itemwidth=120;");
aI("text=Wijnkoeling;url="+path+"wijnkoeling/index.html;showmenu=wijnkoeling;status=Wijnkoeling;itemwidth=76;");
aI("text=Koele berging;url="+path+"koeleberging/index.html;showmenu=koeleberging;status=Koele berging;itemwidth=88;");
aI("text=Contacteer ons;url="+path+"bedrijf/contactgegevens.html;status=Contacteer ons;itemwidth=86;");
aI("text=MovingCool;url="+path+"bedrijf/movingcool.html;status=Wij verhuren ook Biertapwagens, Koel- en vriesboxen, Koel- en vriesaanhangwagens;itemwidth=66;");
}
drawMenus();
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I use Milonic menu 5.04