//<![CDATA[

 var Page = {
 
 		calculateTotal : function() {
 			var sum = eval(document.getElementById("field10")).value*100;
 			sum = sum + eval(document.getElementById("field11")).value*400;
 			sum = sum + eval(document.getElementById("field12")).value*800;

			var engraving = document.getElementById("field18");

			if(sum >= 800) {
				engraving.disabled = false;
			} else {
				engraving.disabled = true;
				engraving.checked = false;
			}

			if(engraving.checked) {
				sum = sum + 200;
			}
			
 			document.getElementById("totalvalue").innerHTML = sum;
 		},
 		
 		setZeros : function() {
 			var f = document.getElementById("field10");
 			if(f.value=="") f.value = "0";
 			f = document.getElementById("field11");
 			if(f.value=="") f.value = "0";
 			f = document.getElementById("field12");
 			if(f.value=="") f.value = "0";
 			return true;
 		},

 		hideLayerDisplay : function( id ) {			
 			var layer = document.getElementById( id );
			layer.style.visibility = "hidden";
 		},
 		
 		showLayerDisplay : function( id ) {			
 			var layer = document.getElementById( id );
			layer.style.visibility = "visible";
 		},
 		
 		showInfolayer : function( url ) {
 			var payfrm = document.getElementById( "infolayer" ).getElementsByTagName("iframe")[0];
 			if( payfrm ) {
 				payfrm.src = url;
 				Page.hideLayerDisplay( "main" );
 				Page.showLayerDisplay( "infolayer" );
 			}
 		},
 		
 		hideInfolayer : function() {
			Page.hideLayerDisplay( "infolayer" ); 		
			Page.showLayerDisplay( "main" );		
 		},
 		
 		showPopup : function( url ) {
			  var d = new Date();
			  var t = d.getTime() ;
			  win = window.open(url , t , "width=650,height=500");
			  win.focus();
 		},
 
  		hideMetanav : function() {
  			var infolayer = document.getElementById( "infolayer" );
  			var iframe = infolayer.getElementsByTagName("iframe")[0];
   			var metanav = document.getElementById( "metanav" );
 			metanav.style.visibility = "hidden";
 			iframe.style.height = "625px";
 			infolayer.style.height = "625px";
 		},

  		showMetanav : function() {
  			var infolayer = document.getElementById( "infolayer" );
  			var iframe = infolayer.getElementsByTagName("iframe")[0];
   			var metanav = document.getElementById( "metanav" );
 			metanav.style.visibility = "visible";
 			iframe.style.height = "600px";
 			infolayer.style.height = "600px";
 		}

		
 };

//]]>