html - Javascript code getElementByID for loop -

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i can't figure out why loop below doesn't work.

i've created function work html not issue. here function works:

function deactivatealltabs() {     document.getelementbyid('tab-header-1').classname = 'tab-header';     document.getelementbyid('tab-header-2').classname = 'tab-header';     document.getelementbyid('tab-header-3').classname = 'tab-header';     document.getelementbyid('tab-content-1').classname = 'tab-content';     document.getelementbyid('tab-content-2').classname = 'tab-content';     document.getelementbyid('tab-content-3').classname = 'tab-content';  }

instead of hard-coding tab-headers , tab-contents ids, thought i'd create loop automatically take care of future additional tabs.

if respectively add set of: 

document.getelementbyid('tab-header-4').classname = 'tab-header'; document.getelementbyid('tab-content-4').classname = 'tab-content';

everything works above. fails when try loop below. idea going wrong?

the error when clicking tab is:

uncaught typeerror: cannot set property 'classname' of null

function deactivatealltabs() {     (var = 0; < tabheaders.length; i++) {         document.getelementbyid('tab-header-'+i).classname = 'tab-header';         document.getelementbyid('tab-content-'+i).classname = 'tab-content';     } }

your loop starts @ 0, tab headers start @ 1.

function deactivatealltabs() {     (var = 1; <= tabheaders.length; i++) {         document.getelementbyid('tab-header-'+i).classname = 'tab-header';         document.getelementbyid('tab-content-'+i).classname = 'tab-content';     } }

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