function showHideItems(myDiv){
	var myDiv = document.getElementById(myDiv);
	    if (myDiv.style.display != "none") {
    	    myDiv.style.display = "none";
        	
    	}
    	else {
        	myDiv.style.display = "block";
			
			
    	}
	}
		function validate(){
			
			if  ( document.emailForm.naam.value == "" )  {
				document.getElementById('usermsg').style.visibility = "visible";
			
				}
			if ( document.emailForm.naam.value != "" ){
				document.getElementById('usermsg').style.visibility = "hidden";
				}
				
				var x = document.emailForm.email.value;
				var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
		
			if (filter.test(x)){
			   document.getElementById('emailmsg').style.visibility = "hidden";
				}
			if (!filter.test(x)){
				document.getElementById('emailmsg').style.visibility = "visible";
				}
				
			if  ( document.emailForm.brief.value == "" )  {
				document.getElementById('briefmsg').style.visibility = "visible";
		
				}
			if ( document.emailForm.brief.value != "" ){
				document.getElementById('briefmsg').style.visibility = "hidden";
				}

   
  			var num = document.emailForm.tel.value.replace(/[^\d]/g,'');
   			if(num.length != 10) {

        	document.getElementById('telmsg').style.visibility = "visible";                   

   			} else {
              document.emailForm.tel.value = num;
			  document.getElementById('telmsg').style.visibility = "hidden"; 
      		}

					
		
		
		 if ( (document.emailForm.naam.value == "") || (!filter.test(x)) || ( document.emailForm.brief.value == "") || (num.length != 10 ) ){
		      document.getElementById('submitmsg').style.visibility = "visible";
		
			  return false;
			  }
		
		
		
			 else if ( ( document.emailForm.email.value.search(";") != -1 ) || ( document.emailForm.email.value.search(",") != -1 ) || ( document.emailForm.email.value.search(" ") != -1 ) ) {
				alert( "U mag maar 1 emailadres invoeren" );
				
			} else {
		  	return true;
			}

		}