function fontbig(size) {
	if(size < 17) {
		document.getElementById('btn_big').onclick = function() {fontbig(size+1);};
		document.getElementById('btn_small').onclick = function() {fontsmall(size-1);};
		document.getElementById('maincontent').style.fontSize = size+"px";

		var tags = document.getElementsByTagName("p");

		for (i = 0; i < tags.length; i++) {
			tags[i].style.fontSize = size+"px";
		}
	}
}

function fontsmall(size) {
	if(size > 8) {
		document.getElementById('maincontent').style.fontSize = size+"px";
		document.getElementById('btn_big').onclick = function() {fontbig(size+1);};
		document.getElementById('btn_small').onclick = function() {fontsmall(size-1);};

		var tags = document.getElementsByTagName("p");

		for (i = 0; i < tags.length; i++) {
			tags[i].style.fontSize = size+"px";
		}
	}
}

function printDocument(){

	  if(document.all && navigator.appVersion.substring(22,23)==4) {
	    self.focus();
	    var OLECMDID_PRINT = 6;
	    var OLECMDEXECOPT_DONTPROMPTUSER = 2;
	    var OLECMDEXECOPT_PROMPTUSER = 1;
	    var WebBrowser = '<object id="WebBrowser1" width="0" height="0" classid="CLSID:8856F961-340A-11D0-A96B-00C04FD705A2"></object>';
	    document.body.insertAdjacentHTML('beforeEnd',WebBrowser);
	    WebBrowser1.ExecWB(OLECMDID_PRINT,OLECMDEXECOPT_DONTPROMPTUSER);
	    WebBrowser1.outerHTML = '';
	  } else {
	    window.print();
	  }
}

function chkForm1()	{
	if(document.formcallback.customercompany.value == "") {
		alert("Bitte geben Sie Ihren Firmennamen ein!");
		document.formcallback.customercompany.focus();
		return false;
	} else	if(document.formcallback.customername.value == "") {
		alert("Bitte geben Sie Ihren Namen ein!");
		document.formcallback.customercompany.focus();
		return false;
	}else 	if(document.formcallback.customernumber.value == "") {
		alert("Bitte geben Sie Ihre Rufnummer ein!");
		document.formcallback.customercompany.focus();
		return false;
	} else {
		return true;
	}
}