function Verifierheight(){

    var divh = document.getElementById('left_column').offsetHeight;
    var divrighth = document.getElementById('right_column').offsetHeight;
    if (divh <divrighth){
        document.getElementById('left_column').style.height = divrighth + 'px';
        document.getElementById('div_page_content').style.height=divrighth + 'px';
    }else{
       document.getElementById('right_column').style.height = divh + 'px';
       document.getElementById('div_page_content').style.height=divh + 'px';
    }    
}