function checkSD(field)
{
document.getElementById("300").checked=true;
if (document.all || document.getElementById)
    field.disabled = true;
	
  else {	
    field.onfocus = field.oldOnFocus;
  } 
}

function checkSP(field)
{
document.getElementById("300").checked=false;
document.getElementById("700").checked=false;
document.getElementById("1500").checked=false;
document.getElementById("5000").checked=false;
document.getElementById("others").checked=false;

if (document.all || document.getElementById)
    field.disabled = true;
	
  else {	
    field.onfocus = field.oldOnFocus;
  }  
}
function clickOthers(field){

document.getElementById("SD").checked=true;
if (document.all || document.getElementById)
    field.disabled = false;
	
  else {	
    field.onfocus = field.oldOnFocus;
  }   
}
function SDButton(field){

document.getElementById("SD").checked=true;
if (document.all || document.getElementById)
    field.disabled = true;
	
  else {	
    field.onfocus = field.oldOnFocus;
  }  
}
function clickRecurring(field){

document.getElementById("SP").checked=true;
if (document.all || document.getElementById)
    field.disabled = false;
	
  else {	
    field.onfocus = field.oldOnFocus;
  }  
}
/*
function enableSpecificDonation(field){
document.getElementById("SD").checked=true;
document.getElementById("SP").checked=false;
 if (document.all || document.getElementById)
    field.disabled = false;
	
  else {
    field.onfocus = field.oldOnFocus;
  }
}
function disableSpecificDonationByRadioButton(field){
document.getElementById("SD").checked=true;
document.getElementById("SP").checked=false;

 if (document.all || document.getElementById) 
    field.disabled = true;
  else {
    field.oldOnFocus = field.onfocus;
    field.onfocus = skip;
  }
}*/