function print_this(){
		var leftvar = (screen.width-800)/2;
		var topvar = (screen.height-600)/2;
		var pw = window.open("/myjs/print.html", "pw", "scrollbars=1, status=0, toolbar=0, location=0, resizable=1, height=600, width=800, left="+leftvar+",top="+topvar);
		pw.focus();
		//var wt = pw.document.getElementById("print_content");
		//wt.innerHTML = "write here";
	}