function elmHeight(elmID){
            var objElement = document.getElementById(elmID);
            if(objElement.clientHeight){
                return objElement.clientHeight;
            } else {
                if(objElement.offsetHeight){
                    return objElement.offsetHeight;
                }
            }
        }
        
        function equalizeHeights(div1, div2){
            if(elmHeight(div1) > elmHeight(div2)){
                //set div2 height to div1 height
                document.getElementById(div2).style.height = elmHeight(div1) + "px";
            } else {
                //set div1 height to div2 height
                document.getElementById(div1).style.height = elmHeight(div2) + "px";
            }
        }
		
		function increaseHeights(div1, div2, div3, div4){
            if(elmHeight(div1) > elmHeight(div2)){
                //set div2 height to div1 height
                document.getElementById(div2).style.height = elmHeight(div1) + "px";
            } else {
                //set div1 height to div2 height
                document.getElementById(div4).style.height = elmHeight(div2) - elmHeight(div3) + "px";
            }
        }