function chkUpdateCart(count)
{

    frm=document.forms['updateCart'];
    len = frm.elements.length;
    
    for( i=0 ; i<len ; i++)
    {

         //check the textbox with the elements name
         field = frm.elements[i].name  //

         if (field.indexOf('q') != -1)
         {
               // if exists do the validation and set the focus to the textbox

               if (frm.elements[i].value=="")
               {
                    alert("Enter Quantity");
                    frm.elements[i].focus();
                    return false;                       
               }

               if (!isInteger(frm.elements[i].value))
               {
                    alert("Enter Number Only.Special Character Not Allowed");
                    frm.elements[i].focus();
                    return false;                       
               }

               if (frm.elements[i].value <= 0)
               {
                    alert("Enter Quantity");
                    frm.elements[i].focus();
                    return false;                       
               }

          }
                         
     }
     
     return true;

}

function isInteger(s)

{   var i;
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}