var min=8;
var max=28;
function increaseFontSize() 
{
	var pageContent=document.getElementsByClassName('pageContent');
	if (pageContent.length==0)
		return;	

	var realS=0;
	for (var j = 0; j < pageContent[0].children.length; j++) 
	{
	   	var p = pageContent[0].children[j];
	      if(p.style.fontSize) 
	      {
	         var s = parseInt(p.style.fontSize.replace("px",""));
	         if(p.tagName=="P")
	         	realS=parseInt(p.style.fontSize.replace("px",""));
	      } 
	      else 
	      {
	      	var s=13;
	      	if(p.tagName=="H1" || p.tagName=="H2" || p.tagName=="B")	      	
	        	s = 15;
	      }
	      if(s!=max) 
	      {
	         s += 1;
	      }
	      p.style.fontSize = s+"px";
	}
	if(pageContent[0].style.fontSize)
	{
		var s = parseInt(pageContent[0].style.fontSize.replace("px",""));
		if(s!=max) 
	         s += 1;		
	}
	else
	{
		if(realS!=0)
			s=realS;
		var s=13;
	}
	pageContent[0].style.fontSize = s+"px";
	
}

function decreaseFontSize() 
{
	var pageContent=document.getElementsByClassName('pageContent');
	if (pageContent.length==0)
		return;
	var realS = 0;
	for (var j = 0; j < pageContent[0].children.length; j++) 
	{
	   	var p = pageContent[0].children[j];

	      if(p.style.fontSize) 
	      {
	         var s = parseInt(p.style.fontSize.replace("px",""));
	         if(p.tagName=="P")
		         	realS=parseInt(p.style.fontSize.replace("px",""));
	      } 
	      else 
	      {
	      	var s=13;
	      	if(p.tagName=="H1" || p.tagName=="H2" || p.tagName=="B")	      	
	        	s = 15;
	      }
	      if(s!=min) 
	      {
	         s -= 1;
	      }
	      p.style.fontSize = s+"px";
	} 
	if(pageContent[0].style.fontSize)
	{
		var s = parseInt(pageContent[0].style.fontSize.replace("px",""));
		if(s!=min) 
	         s -= 1;		
	}
	else
	{
		if(realS!=0)
			s=realS;
		var s=13;
	}
	pageContent[0].style.fontSize = s+"px";
}

function preview(field_name)
{
	rez="";
	for (var i=0; i<=field_name; i++) 
	{
		nam1="product"+i;
		if (eval("typeof document.forms['kontakt']."+nam1)!='undefined')
			if(eval("document.forms['kontakt']."+nam1+".checked"))
			{
			 	res=eval("document.forms['kontakt']."+nam1+".value");
				if (i==0) {rez=res;}
				else {rez=rez+", "+res;}
			}
	}
	document.forms['kontakt'].content.value=rez;
}

function validForm()
{
	allfields="";
	if (document.forms['kontakt'].name.value=="")
		{allfields=allfields+"Name, ";}
	if (document.forms['kontakt'].strase.value=="")
		{allfields=allfields+"Strase, ";}
	if (document.forms['kontakt'].plz.value=="")
		{allfields=allfields+"PLZ, ";}
	if (document.forms['kontakt'].ort.value=="")
		{allfields=allfields+"Ort, ";}
	if (document.forms['kontakt'].email.value=="")
		{allfields=allfields+"E-Mail, ";}
	var tags=document.getElementsByTagName("input");
	var found=false;
	for (var i = 0; i < tags.length; i++)  
		if(tags[i].type=="checkbox")
			if(tags[i].checked)
				found=true; 
	if(!found)
	{
		alert("Bitte wählen Sie ein Produkt");
		return false;
	}
	if (allfields=="")
	{
		return true;
	}
	else if (allfields!="")
	{
		alert ("Bitte füllen Sie folgende Felder aus: "+allfields);
		return false;
	}

}