function cmdlease_Click(form){
     if (form.LValue.value == 0 || form.LValue.value.length == 0){
        alert ("The on Lease Value filed can't be 0");
        form.LValue.focus();
     }
     else if (form.LValue.value < 1000){
        alert ("The on Lease Value must be at least £1000.00");
        form.LValue.focus();
        }	
     else if (form.LValue.value > 40000){
        alert ("The on Lease Value must be less than £40000.00");
        form.LValue.focus();
        }
     else {
     calculateLease(form);     }
     }

  function calculateLease(form){
     LeaseValue =    form.LValue.value;
     
    
    if (form.Quarters.value == 1){
     Nqarters = 9;
      if ( LeaseValue > 10000){
       LFactor = 129.75;
       }
       else{ 
       LFactor = 131;
       }
    }
    else if (form.Quarters.value == 2){
       Nqarters = 13;
       if ( LeaseValue > 10000){
       LFactor = 94.16;
       }
       else{ 
       LFactor = 95.05;
       }
    }
    else if (form.Quarters.value == 3){
       Nqarters = 17;
       if ( LeaseValue > 10000){
       LFactor = 75.42;
       }
       else{ 
       LFactor = 76.14;
       }
    }
    else if (form.Quarters.value == 4){
       Nqarters = 21;
       if ( LeaseValue > 10000){
       LFactor = 63.9;
       }
       else{ 
       LFactor = 64.5;
       }
    }  
    tc = Math.round(LeaseValue * LFactor/10); 
    form.QRental.value = "£" +   tc/100;
    tcc = tc * Nqarters;
    form.TCost.value = "£" + (tcc/100) ;  
}