then you want to loop through them all and set their checked attribute to true...to do this you would need to number them, and access throught document.formName[] array.
You could make them radio buttons, and access them thru their own array if you wish.
Or you could go thru the entire form, asking each element what it's type is, and if it returns checkbox, set the value for checked.
for(var j = 0;j<document.formName.elements.length;j++){
if(document.formName.elements[j].type == 'checkbox'){
document.formName.elements[j].checked=true;
} "Alright whatever man, I'll hook up the hair, but I aint touchin the ring...Cause I'm still a pla--yer"