Array Intersect

Single dimensional array intersection function.

HTML

<div id="tests"></div>

CSS

.blue {
    color: #33f;
}

.red {
    color: #f33;
}

JavaScript

(function() {        
    function arrayIntersect() {
        var tmpArray = [];
        var intersect = [];
        var args = [];

        if(arguments.length > 1) {
            args = [arguments];
        } else {
            args = arguments;
        }
        
        if(args[0].length < 1) {
            intersect = "No intersection";
        } else if(args[0].length === 1) {
            intersect = args[0][0];
        } else {
            for(var i=0; i<args[0].length; i++) {
                if(typeof args[0][i+1] !== 'undefined') {
                    tmpArray.push(getIntersect(args[0][i],args[0][i+1]));
                }
            }

            intersect = arrayIntersect(tmpArray);
        }

        function getIntersect(a,b) {
            var innersek = [];
            for(var i=0; i<a.length; i++) {
                for(var j=0; j<b.length; j++) {
                    if(a[i]===b[j]/*teehee*/) {
                        innersek.push(a[i]);
                    }
                }
            }
            return innersek;
        }
        
        return intersect;
    }
    
    
    //test setup
    var test1 = ['red','green','blue','yellow','mauve'];
    var test2 = ['orange','blue','red','mauve'];
    var result = arrayIntersect(test1,test2,test3,test4,test5);
    var str = document.getElementById('tests').innerHTML = test1 + '<br>' + test2;
    var output;
    
    for(var i=0; i<result.length; i++) {
        var find = result[i];
        var replace = new RegExp(find, 'g');
        output = str.replace(replace, '<span class="'+result[i]+'">'+result[i]+'</span>');
        str = output;
    }
    
    document.getElementById('tests').innerHTML = output;
})();