function changeScreenImages(url_screen,id_screen,count_screen) {
	document.getElementById('screen').src = url_screen;
	for (var i=1;i<=count_screen;i++) {
		if (i == id_screen) {
			document.getElementById('screen_li_'+i).className = 'active';
		} else {
			document.getElementById('screen_li_'+i).className = '';
		}
	}
}

function popUp(URL,w,h) {
		day = new Date();
		id = day.getTime();
		eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width="+w+",height="+h+"');");
}

function unhide(divID) {
	  var item = document.getElementById(divID);
	  if (item) {
	    item.className=(item.className=='hidden')?'unhidden':'hidden';
	  }
}	

function changeFontSize(inc)
{
	  var p = document.getElementsByTagName('p');
	  for(n=0; n<p.length; n++) {
	    if(p[n].style.fontSize) {
	       var size = parseInt(p[n].style.fontSize.replace("px", ""));
	    } else {
	       var size = 12;
	    }
	    p[n].style.fontSize = size+inc + 'px';
	   }
}