[poorking]

function removeFromArray(array, element){
		var index;
		while( ( index = array.indexOf(element) ) !== -1){
			array.splice(index, 1);
		}
	}

	function substractSequences(array1, array2){
		for(var i = 0, l = array2.length; i < l; i ++){
			removeFromArray(array1, array2[i]);
		}
	}

	var a = [1,2,3,4,4,4,1,1,1,1,2,2,5];

	var b = [1,2,4];

	substractSequences(a, b);

	alert(a);