Delete only the children divs from a parent div

Hi, I'm trying to delete all the children divs that I created dynamically in a parent div. The parent div contains different controls, not just divs.

 var imgContainer = document.getElementById("ContentPlaceHolder1_div_Container");
    var childDivs = imgContainer.getElementsByTagName("div");

    var NumberOfDivs = childDivs.length;

    for (i = 0; i < NumberOfDivs; i++) {
        imgContainer.removeChild(childDivs[i]);
    }

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If there is only one child div, the code works fine. However, when I append multiple divs I get the following error

"JavaScript runtime error: No such interface supported"

Any ideas?

Thanks