window.onresize=windowHeight;
function windowHeight() {
  var myHeight = 0;
  if( typeof( window.innerWidth ) == 'number' ) {
    //Non-IE
    myHeight = window.innerHeight;
  } else if( document.documentElement && document.documentElement.clientHeight) {
    //IE 6+ in 'standards compliant mode'
    myHeight = document.documentElement.clientHeight;
  } else if( document.body && document.body.clientHeight) {
    //IE 4 compatible
    myHeight = document.body.clientHeight;
  }
	var middle=document.getElementById("middle");	
	var left_column=document.getElementById("left_column");
	var center_column=document.getElementById("center_column");
	var right_column=document.getElementById("right_column");
	var top=document.getElementById("top");	
	middle_height=myHeight-top.offsetHeight; 
	center_column.style.height='';
	center_column_height=center_column.offsetHeight;
	left_column.style.height='';
	left_column_height=left_column.offsetHeight;
	if ((middle_height>center_column_height) && (middle_height>left_column_height))
		{
			middle.style.height=middle_height+'px';
			left_column.style.height=middle_height+'px';
			center_column.style.height=middle_height+'px';
			right_column.style.height=middle_height+'px';
		}
	else if (left_column_height>center_column_height)
	{
		{
			middle.style.height=left_column_height+'px';
			left_column.style.height=left_column_height+'px';
			center_column.style.height=left_column_height+'px';
			right_column.style.height=left_column_height+'px';
		}
	}
	else
		{
			middle.style.height=center_column_height+'px';
			left_column.style.height=center_column_height+'px';
			center_column.style.height=center_column_height+'px';
			right_column.style.height=center_column_height+'px';
		}
	}

function play()	{
	var player=document.getElementById("player");					
	var play=document.getElementById("play");					
	play.style.display = "none";
	player.style.display = "inline";
}

function showPaymentItem(item)	{
	var credit=document.getElementById("credit");					
	var receipt=document.getElementById("receipt");					
	if (item == 'credit')
	{
		credit.style.display = "inline";
		receipt.style.display = "none";
	} else if (item == 'receipt')
	{
		credit.style.display = "none";
		receipt.style.display = "inline";
	} else
	{
		credit.style.display = "none";
		receipt.style.display = "none";
	}
}

function DieterySpecifyField(action)	{
	var dietary_restrictions_specified=document.getElementById("dietary_restrictions_specified");					
	if (action == 'enable')
	{
		dietary_restrictions_specified.style.display = "inline";
	} else if (action == 'disable') 
	{
		dietary_restrictions_specified.style.display = "none";
	} 
}