function EnableDisableButton(chk,btn)
{
    if (chk.checked)
        btn.disabled=false;
     else
        btn.disabled=true;
}
function ButtonClicked(btn)
{
   if (event.keyCode == 13)
   { 
       event.returnValue=false;
       event.cancel = true;
       btn.click();
    }
}
function Trim(sString) 
{
    while(sString.substring(0,1) == ' ')
        {
        sString = sString.substring(1, sString.length);
        }
    while (sString.substring(sString.length-1, sString.length) == ' ')
        {
        sString = sString.substring(0,sString.length-1);
        }
    return sString;
}