exam 28.07.2014 JavaScript first problem

1.problemexamJavacript28.07.2014S

function solve(input) {

    var first = Number(input[0]);
    var second = Number(input[1]);

console.log('<ul>');

    var together = [];

    for (var i = first; i <= second; i++) {

     together.push(i);
    }


    for (var j = 0; j < together.length; j++){

        var currentNumber = together[j].toString();
        var currentNumAsArray = currentNumber.split('');

         var firstDouble = currentNumAsArray[0] + currentNumAsArray[1];

         if (currentNumber.indexOf(firstDouble, 2) !== -1) {
             console.log("<li><span class='rakiya'>" + currentNumber + "</span><a href=" + '"' + "view.php?id=" + currentNumber + ">View</a></li>");
         }

        else {
             var secondDouble = currentNumAsArray[1] + currentNumAsArray[2];

                 if (currentNumber.indexOf(secondDouble, 3) !== -1) {
                     console.log("<li><span class='rakiya'>" + currentNumber + "</span><a href=" + '"' + "view.php?id=" + currentNumber + ">View</a></li>");
                 }
                 else {
                     var thirdDouble = currentNumAsArray[2] + currentNumAsArray[3];
                     if (currentNumber.indexOf(thirdDouble, 4) !== -1) {
                         console.log("<li><span class='rakiya'>" + currentNumber + "</span><a href=" + '"' + "view.php?id=" + currentNumber + ">View</a></li>");
                     }
                     else {
                         var fourthDouble = currentNumAsArray[3] + currentNumAsArray[4];
                         if (currentNumber.indexOf(fourthDouble, 5) !== -1) {
                             console.log("<li><span class='rakiya'>" + currentNumber + "</span><a href=" + '"' + "view.php?id=" + currentNumber + ">View</a></li>");
                         }
                         else {
                             var fifthDouble = currentNumAsArray[4] + currentNumAsArray[5];
                             if (currentNumber.indexOf(fifthDouble, 6) !== -1) {
                                 console.log("<li><span class='rakiya'>" + currentNumber + "</span><a href=" + '"' + "view.php?id=" + currentNumber + ">View</a></li>");
                             }
                             else {
                                 var sixthDouble = currentNumAsArray[5] + currentNumAsArray[6];
                                 if (currentNumber.indexOf(sixthDouble, 7) !== -1) {
                                     console.log("<li><span class='rakiya'>" + currentNumber + "</span><a href=" + '"' + "view.php?id=" + currentNumber + ">View</a></li>");
                                 }
                                 else {
                                     console.log("<li><span class='num'>" + currentNumber + "</span></li>");
                                 }
                             }
                         }
                     }
                 }

         }


    }


    console.log('</ul>');

}