Checking All Checkboxes In Table At Top Of Column

I am writing a table which will have the schema of 3 elements:
<input onclick="adjust(/%main%/)"type = "checkbox" id = "all">All</input>ProcessStatus
When I press the check box, it would run the adjust function and pass in the variable \%main%\ which is correct but i get a silent error with firebug on the document.getElementbyId('/%main%/'); line.
function adjust(t){
alert(t);
var s = t + "_job";
alert(s);
var t = document.getElementById(s);selects table but errors here! =/
var t_rows = t.rows.length;
if checkbox is checked, check all, otherwise, uncheck all.
for(var i = 1; i< t_rows;i++){
if (t.rows[0].cells[0].childNodes[0].clicked){
t.rows[i].cells[0].childNodes[0].clicked=true;
}else{
t.rows[i].cells[0].childNodes[0].clicked=false;
}}}
I just want to add, that /%main%/ is the id of a table.