function checkvelden(item) {
		var fout=new Array();
		tekst="Uw invoer bevat de volgende fout:\n\n";
		fout="";
		reg_exp=/^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/
		
		if (!item.email.value.match(reg_exp)) {fout+= '\'' + item.email.value+'\' is geen correct e-mail adres!';}
		//if (item.inhoud.value=='') {fout+="\n Er is niets ingevuld als opmerking of vraag.";}
		if (item.naam.value=='') {fout+="\n Er is geen naam ingevuld.\n";}
		if (fout.indexOf("\n")!=fout.lastIndexOf("\n")) {tekst="Uw invoer bevat de volgende fouten:\n\n";} else {tekst="Uw invoer bevat de volgende fout:\n\n";}
		if (fout!="") {alert(tekst+fout);return false;}
	}
	
	var mn_doc_start=false;;
	
		  function init(){

	  mn_table = document.getElementById("main_table").offsetHeight;
	  mn_cont = document.getElementById("content").offsetHeight;
	  mn_height = mn_cont - mn_table + 90;
	  if (mn_height < 0 ){
	  mn_height = 0;	
	  document.getElementById('table2_connect').style.height = '5px';
	  document.getElementById('table2_connect').style.backgroundImage = 'url(images/frame/v_con.gif)';
	  document.getElementById('dots_v_end').style.marginTop = '0px';
	  document.getElementById('table2_space').innerHTML = '';
	  
	  }else{
	  document.getElementById('table2_space').innerHTML = '&nbsp;';
	  document.getElementById('table2_connect').style.backgroundImage = 'url(images/frame/connect.gif)';
	  document.getElementById('table2_connect').style.height = '18px';
		document.getElementById('dots_v_end').style.marginTop = '10px';
		
		}
	  document.getElementById('table2').style.height = mn_height + 'px';
	  document.getElementById('table3').style.marginTop = mn_height - 26 +  'px';
	  }
	  
onresize=init;