function showDimensions() {
    window.open('help/dimensions.htm', 'GateTypes', 'height=700, width=780,status= no, resizable= no, scrollbars=yes, toolbar=no,location=no,menubar=no ');
}
function showStyles() {
    window.open('help/gate-styles.htm', 'GateTypes', 'height=700, width=680,status= no, resizable= no, scrollbars=yes, toolbar=no,location=no,menubar=no ');
}