var isNormal;
isNormal = 1;

function setActiveStyleSheet(title) {
   var i, a, main;
   for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
     if(a.getAttribute("rel").indexOf("style") != -1
        && a.getAttribute("title")) {
       a.disabled = true;
       if(a.getAttribute("title") == title) a.disabled = false;
     }
   }
}

function printable() {
	if (isNormal == 1) {
		setActiveStyleSheet('printable');
		isNormal = 0;
	} else {
		setActiveStyleSheet('normal');
		isNormal = 1;
	}
}