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If you know the index of the element to remove, you could use the splice method, like this:

var a=['one','two','three','four'];
a.splice(1,1); // Removes 1 element from index 1
alert(a); // Results in 'one','three','four'

If you don’t know the index, but the value of the element, you could add a little method to the Array class like this:

Array.prototype.remove=function(s){
  for(i=0;i<this .length;i++){
    if(s==this[i]) this.splice(i, 1);
  }
}
var a=['one','two','three','four'];
a.remove('three');
alert(a); // Results in 'one','two','four'