function unCheck(form,group)
{form.getInputs('checkbox').each(function(elem)
{if(elem.id.indexOf(group)>-1)elem.checked=false;});}
function checkAll(field)
{for(i=0;i<field.length;i++)
field[i].checked=true;}
function uncheckAll(field,allfield)
{for(i=0;i<field.length;i++)
{field[i].checked=false;}
allfield.checked=true;}
function checkForAllTicked(field,allfield)
{var checkall=true;for(i=0;i<field.length;i++)
{if(field[i].checked)checkall=false;}
allfield.checked=checkall;}