function remove_content(){
	document.getElementById('postcode').value='';
}
function set_content(){
	if(!document.getElementById('postcode').value){
		document.getElementById('postcode').value='Enter Your Postcode';
	}
}
function numbersonly_sp(myfield, e, dec,sp){
				var key;
				var keychar;
				if (window.event)
					 key = window.event.keyCode;
				else if (e)
					 key = e.which;
				else
					 return true;
				keychar = String.fromCharCode(key);
				
				// control keys
				if ((key==null) || (key==0) || (key==8) || 
						(key==9) || (key==13) || (key==27) )
					 return true;
				
				// numbers
				else if ((("0123456789"+sp).indexOf(keychar) > -1))
					 return true;
				
				// decimal point jump
				else if (dec && (keychar == "."))
					 {
					 myfield.form.elements[dec].focus();
					 return false;
					 }
				else
					 return false;
					 
		}