function validate()
{
if(document.Search.src4.value.length == 0 && document.Search.des4.value.length == 0)
{
//4th row is ok.Check other 3 rows
      if(document.Search.src3.value.length == 0 && document.Search.des3.value.length == 0)
     {
     //3th row is ok.Check other 2 rows

             if(document.Search.src2.value.length == 0 && document.Search.des2.value.length == 0)
             {
             //2th row is ok.Check other 1 row
                    if(document.Search.src1.value.length >0 && document.Search.des1.value.length > 0)
                    {
                      alert("ok");

                    }
                    else if(document.Search.src1.value.length ==0)
                         {
                                alert("fill src1");

                         }else if(document.Search.des1.value.length == 0)
                             {
                                 alert("fill des1");
                             }





             }
             else
             if(document.Search.src2.value.length > 0 && document.Search.des2.value.length > 0 )
             {
                 alert("2nd row is ok");
                 if(document.Search.src1.value.length > 0 && document.Search.des1.value.length > 0 )
                 {
                     alert("1st row is ok");
                 }
                 else if(document.Search.src1.value.length > 0)
                      {
                            alert("fill des1");

                      }
                      else
                      {
                            alert("fill src1");

                      }

               }
               else if(document.Search.src2.value.length > 0)
             {
                 alert("fill des2");

                 first();
             }
             else
             {
                 alert("fill src2");

                 first();
             }






     }
     else
     {
        if(document.Search.src3.value.length > 0 && document.Search.des3.value.length > 0 )
        {
            alert("3rd row is ok");
            if(document.Search.src2.value.length > 0 && document.Search.des2.value.length > 0 )
            {
                 alert("2nd row is ok");
                 if(document.Search.src1.value.length > 0 && document.Search.des1.value.length > 0 )
                 {
                     alert("1st row is ok");
                 }
                 else if(document.Search.src1.value.length > 0)
                      {
                            alert("fill des1");

                      }
                      else
                      {
                            alert("fill src1");

                      }

            }
            else if(document.Search.src2.value.length > 0)
                 {
                     alert("fill des2");
                     first();

                 }
                 else
                {
                     alert("fill src2");
                     first();
                }
        }
        else if(document.Search.src3.value.length > 0)
             {
                 alert("fill des3");
                 second();
                 first();
             }
             else
             {
                 alert("fill src3");
                 second();
                 first();
             }





/////////////////////////////////////////////////////
///////////////////////////////////////////////////////
//////////////////////////////////////////////
     }









}
else
{
// there r elements in the 4th row. So check all the rows
      if(document.Search.src4.value.length > 0 && document.Search.des4.value.length > 0 )
      {////////////////////////////////////////////////////
        alert("4th row is ok");
        if(document.Search.src3.value.length > 0 && document.Search.des3.value.length > 0 )
        {
            alert("3rd row is ok");
            if(document.Search.src2.value.length > 0 && document.Search.des2.value.length > 0 )
            {
                 alert("2nd row is ok");
                 if(document.Search.src1.value.length > 0 && document.Search.des1.value.length > 0 )
                 {
                     alert("1st row is ok");
                 }
                 else if(document.Search.src1.value.length > 0)
                      {
                            alert("fill des1");

                      }
                      else
                      {
                            alert("fill src1");

                      }

            }
            else if(document.Search.src2.value.length > 0)
                 {
                     alert("fill des2");
                     first();

                 }
                 else
                {
                     alert("fill src2");
                     first();
                }
        }
        else if(document.Search.src3.value.length > 0)
             {
                 alert("fill des3");
                 second();
                 first();
             }
             else
             {
                 alert("fill src3");
                 second();
                 first();
             }
      }
      else if (document.Search.src4.value.length > 0)
           {
               alert("fill des4 ");
               third();
               second();
                 first();
           }
           else
           {
               alert("fill src4");
               third();
                second();
                 first();

           }

}

}

function fourth(){



}

function third(){
if(document.Search.src3.value.length >0 && document.Search.des3.value.length > 0)
                    {
                      alert("ok");

                    }
                    else if(document.Search.src3.value.length ==0)
                         {
                                alert("fill src3");

                         }else if(document.Search.des3.value.length == 0)
                             {
                                 alert("fill des3");
                             }
}

function second(){
if(document.Search.src2.value.length >0 && document.Search.des2.value.length > 0)
                    {
                      alert("ok");

                    }
                    else if(document.Search.src2.value.length ==0)
                         {
                                alert("fill src2");

                         }else if(document.Search.des2.value.length == 0)
                             {
                                 alert("fill des2");
                             }
}

function first(){
if(document.Search.src1.value.length >0 && document.Search.des1.value.length > 0)
                    {
                      alert("ok");
                      
                    }
                    else if(document.Search.src1.value.length ==0)
                         {
                                alert("Please insert first departure location");

                         }else if(document.Search.des1.value.length == 0)
                             {
                                 alert("Please insert first destination");
                             }
}

function setDefaultDate(){
 var fm = document.Search;
 var dd = new Date();
 fm.cal1.value = dd.getDate()+"/"+(dd.getMonth()+1)+"/"+ dd.getFullYear();
 fm.firstDate.value =(dd.getMonth()+1)+"/"+  dd.getDate()+"/"+ dd.getFullYear();
}

function getFirstDes(){
   document.Search.src2.value = document.Search.des1.value;
}
function getSecondDes(){
   document.Search.src3.value = document.Search.des2.value;
}
function getThirdDes(){
   document.Search.src4.value = document.Search.des3.value;
}

function setSelectedText(place, select){
          
	//place.value = select.options[select.selectedIndex].text;
	place.value = select.value;
	
}
function changeToUpperCase(code){

   code.value = code.value.toUpperCase();
}