function showHide(value){
        oSelInternal=document.getElementById('selInternal');
        oSelExternal=document.getElementById('selExternal');
        if(value=='Internal'){
            oSelInternal.style.display='block';
            oSelExternal.style.display='none';        
        }
        else{
            oSelInternal.style.display='none';
            oSelExternal.style.display='block';        
        }
    }
    function checkSubmit(){
        oRDInternal=document.getElementById('rdInternal');
        oRDExternal=document.getElementById('rdExternal');
        oSelInternal=document.getElementById('selInternal');
        oSelExternal=document.getElementById('selExternal');
        oSelPrice=document.getElementById('selPrice');
        if(oRDInternal.checked==true) window.location='Internal.aspx?Price='+oSelPrice.value+'&CityID='+oSelInternal.value;
        else window.location='External.aspx?Price='+oSelPrice.value+'&NationID='+oSelExternal.value;
    }