js code works in IE, Opera but not in Firefox

[dscriptor]

Hi all,

i got a problem here in this Javascipt code to check all the checkbox with an array name of orderitem[]:

function checkAll(myform)
			{
			var field = document.getElementsByTagName("orderitem");
			for (i = 0; i < field.length; i++)
				field[i].checked = true ;
			
			
			}
			
		var formblock;
		var forminputs;
		 
		function prepare() {
		  formblock= document.getElementById('myform');
		  forminputs = formblock.getElementsByTagName('input');
		}
		 
		function select_all(name, value) {
		  for (i = 0; i < forminputs.length; i++) {
			// regex here to check name attribute
			var regex = new RegExp(name, "i");
			if (regex.test(forminputs[i].getAttribute('name'))) {
			  if (value == '1') {
				forminputs[i].checked = true;
				document.myform.total.value = document.myform.totalamount.value;
			  } else {
				forminputs[i].checked = false;
				document.myform.total.value = 0;
		  }
			}
		  }
		}
		 
		if (window.addEventListener) {
		  window.addEventListener("load", prepare, false);
		} else if (window.attachEvent) {
		  window.attachEvent("onload", prepare)
		} else if (document.getElementById) {
		  window.onload = prepare;
		}

the code above works fine in IE and Opera but not in Firefox.
I really don't know what's the problem here.

anyone?

Thanks.

[stymiee]

Have you checked the firefox JavaScript error console to see if it is reporting an error?

[dscriptor]

Error console says: formblock has no properties..

what do i do? sorry for being noobie here.

thanks..

[dscriptor]

thanks. i think i got it. it's only because i have no ID in my form.

thanks!