function toggleShow(szDivID, iState) // 1 visible, 0 hidden
{
    if(document.layers) {      //NN4+
       document.layers[szDivID].display = iState ? "block" : "none";
    } else if(document.getElementById) {      //gecko(NN6) + IE 5+
        var obj = document.getElementById(szDivID);
        obj.style.display = iState ? "block" : "none";
    } else if(document.all) {   // IE 4
        document.all[szDivID].style.display = iState ? "block" : "none";
    }
}

function replace(offId,onId) {
    toggleShow(offId,0);
    toggleShow(onId, 1);
}

var SHOW = 'C L I C K   T O   S H O W';
var HIDE = 'C L I C K   T O   H I D E';

function toggle(btnId,divId) {
    var btn = document.getElementById(btnId);
    var iState;
    if (btn.value == HIDE) {
        toggleShow(divId,0);
        btn.value = SHOW;
    } else {
        toggleShow(divId,1);
        btn.value = HIDE;
    }
}