/*--------------------------------------------------------------------------------
			 AJAX Queue
		----------------------------------------------------------------------------------*/		
		var AJAXQueue = new Array;
		var AJAXServiceRunning=false;
		var AJAXReturnfunction;
		var httpAjax = false;
		function getSVG(fileName) {
			paramstr="svgname="+escape(fileName);
			AjaxService("svgtocanvas.php",paramstr,"returnedSVG");
		}
		
		/*--------------------------------------------------------------------------------
				AjaxService
				
				This is the only interface to the AJAX wrapper. This makes the ajax service 
				browser agnostic and provides a single interface for all of the services.
				
				Each service uses a different url and a different parameter layout.
								
		----------------------------------------------------------------------------------*/
		function AjaxService(servicename,serviceparam,returnfunction) {
			AJAXQueue.push(servicename);
			AJAXQueue.push(serviceparam);
			AJAXQueue.push(returnfunction);
			if( !AJAXServiceRunning ) {
				AJAXServiceRunning = true;
				AJAXReturnfunction = AJAXQueue.pop();
				var Aparam = AJAXQueue.pop();
				var Aservice = AJAXQueue.pop();
				AjaxServiceExec( Aservice, Aparam );
			}				
		}
		
		/*--------------------------------------------------------------------------------
				AjaxService
				
				This is the only interface to the AJAX wrapper. This makes the ajax service 
				browser agnostic and provides a single interface for all of the services.
				
				Each service uses a different url and a different parameter layout.
								
		----------------------------------------------------------------------------------*/
		function AjaxServiceExec(servicename, serviceparam) {
		// Parameters are set, initiate AJAX engine
			if( window.XMLHttpRequest ) {
				httpAjax = new XMLHttpRequest();
				if( httpAjax.overrideMimeType ) {
					httpAjax.overrideMimeType( 'text/xml' );
				}
			} else if ( window.ActiveXObject ) {
				try{
					httpAjax = new ActiveXObject( "Msxml2.XMLHTTP" );
				} catch(e) {
					try {
						httpAjax = new ActiveXObject( "Microsoft.XMLHTTP" );
					} catch(e) {
						alert( "Couldnīt build an AJAX instance." );
						return false;
					}
				}
			}
			// Send request to Server and initiate callback.
			try{
				httpAjax.onreadystatechange = getPage;
		    } 
			catch(e) {
				alert( "onreadystatechange didnīt go well!" );
				return false;
			} 
			try{
				httpAjax.open( 'POST', servicename, true );
				httpAjax.setRequestHeader( "Content-Type", "application/x-www-form-urlencoded;" );
		    } 
			catch(e) {
				alert( "Couldnīt open url." );
				return false;
		    } 
			try{
				httpAjax.send( serviceparam );				
		    } 
			catch(e) {
				alert( "Couldnīt send request." );
				return false;
			}
			return true;
		}
		
		/*--------------------------------------------------------------------------------
				getPage

				This is the AJAX callback function. It detects the invoking service and handles
				the reply from each service accordingly.				
								
		----------------------------------------------------------------------------------*/

	function getPage() {				
		if(httpAjax.readyState == 4) {
			tr = httpAjax.responseText;
			eval( AJAXReturnfunction + '(tr);' );
				if( AJAXQueue.length > 0 ) {
					AJAXReturnfunction = AJAXQueue.pop();
					var Aparam = AJAXQueue.pop();
					var Aservice = AJAXQueue.pop();
					AjaxServiceExec( Aservice, Aparam );
				} else {
					AJAXServiceRunning = false;				
				}
				return true;				
		} else {
	  		// If any other ready state than prepared, do nothing!
	  }
	}
	
	
	function returnedSVG( htmltext ) {
		var conto = document.getElementById( 'content' );
		conto.innerHTML = htmltext;
		str = 'var acanvas=document.getElementById("previewCanvas");acanvas.width=700;var c=acanvas.getContext("2d");' + htmltext;
		eval(str);
	}