function showhide(obj) {
  if (obj != null) {
  	obj.style.visibility = "hidden";
  }
 }

 function detectResolution() {
  var h = 0;
  
	//alert(screen.availWidth + ' x ' + screen.availHeight);
	
  /*		
  scrollbar-face-color: rgb(249, 249, 249);
    SCROLLBAR-HIGHLIGHT-COLOR: #004677; 
    SCROLLBAR-SHADOW-COLOR: #004677; 
    SCROLLBAR-3DLIGHT-COLOR: rgb(249, 249, 249); 
    SCROLLBAR-ARROW-COLOR: #004677; 
  	SCROLLBAR-TRACK-COLOR: rgb(249, 249, 249); 
    SCROLLBAR-DARKSHADOW-COLOR: rgb(249, 249, 249);
  */
  
    if ((screen.width > 1024) && (screen.height > 768))
    {
  	h = 535;
   }
    else
    {		
  	h = 280;			
    }
  
  document.write('<style>div#mainframe { width: 100%; height: ' + h + '; overflow: auto; scrollbar-face-color: #ebf5fc; border:0pt black solid; }</style>');
 } // end function
 
 function detectBrowser() {
 
  	var browserName = navigator.appName;
   
    if (browserName == "Netscape")
    {
    }
    else 
    { 
      if (browserName == "Microsoft Internet Explorer")
      {      
      }
      else
      {
       //alert("What ARE you browsing with here?");
      }
    }
 } // end function
 
	function isValidEmail(str) {
  	return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
 	}
	
	function emailCheck (emailStr) {
    /* The following pattern is used to check if the entered e-mail address
       fits the user@domain format.  It also is used to separate the username
       from the domain. */
    var emailPat=/^(.+)@(.+)$/
    /* The following string represents the pattern for matching all special
       characters.  We don't want to allow special characters in the address. 
       These characters include ( ) < > @ , ; : \ " . [ ]    */
    var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
    /* The following string represents the range of characters allowed in a 
       username or domainname.  It really states which chars aren't allowed. */
    var validChars="\[^\\s" + specialChars + "\]"
    /* The following pattern applies if the "user" is a quoted string (in
       which case, there are no rules about which characters are allowed
       and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
       is a legal e-mail address. */
    var quotedUser="(\"[^\"]*\")"
    /* The following pattern applies for domains that are IP addresses,
       rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
       e-mail address. NOTE: The square brackets are required. */
    var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
    /* The following string represents an atom (basically a series of
       non-special characters.) */
    var atom=validChars + '+'
    /* The following string represents one word in the typical username.
       For example, in john.doe@somewhere.com, john and doe are words.
       Basically, a word is either an atom or quoted string. */
    var word="(" + atom + "|" + quotedUser + ")"
    // The following pattern describes the structure of the user
    var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
    /* The following pattern describes the structure of a normal symbolic
       domain, as opposed to ipDomainPat, shown above. */
    var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")
    
    
    /* Finally, let's start trying to figure out if the supplied address is
       valid. */
    
    /* Begin with the coarse pattern to simply break up user@domain into
       different pieces that are easy to analyze. */
    var matchArray=emailStr.match(emailPat)
    if (matchArray==null) {
      /* Too many/few @'s or something; basically, this address doesn't
         even fit the general mould of a valid e-mail address. */
    	alert("Email address seems incorrect (check @ and .'s)")
    	return false
    }
    var user=matchArray[1]
    var domain=matchArray[2]
    
    // See if "user" is valid 
    if (user.match(userPat)==null) {
        // user is not valid
        alert("The username doesn't seem to be valid.")
        return false
    }
    
    /* if the e-mail address is at an IP address (as opposed to a symbolic
       host name) make sure the IP address is valid. */
    var IPArray=domain.match(ipDomainPat)
    if (IPArray!=null) {
        // this is an IP address
    	  for (var i=1;i<=4;i++) {
    	    if (IPArray[i]>255) {
    	        alert("Destination IP address is invalid!")
    		return false
    	    }
        }
        return true
    }
    
    // Domain is symbolic name
    var domainArray=domain.match(domainPat)
    if (domainArray==null) {
    	alert("The domain name doesn't seem to be valid.")
        return false
    }
    
    /* domain name seems valid, but now make sure that it ends in a
       three-letter word (like com, edu, gov) or a two-letter word,
       representing country (uk, nl), and that there's a hostname preceding 
       the domain or country. */
    
    /* Now we need to break up the domain to get a count of how many atoms
       it consists of. */
    var atomPat=new RegExp(atom,"g")
    var domArr=domain.match(atomPat)
    var len=domArr.length
    if (domArr[domArr.length-1].length<2 || 
        domArr[domArr.length-1].length>3) {
       // the address must end in a two letter or three letter word.
       alert("The address must end in a three-letter domain, or two letter country.")
       return false
    }
    
    // Make sure there's a host name preceding the domain.
    if (len<2) {
       var errStr="This address is missing a hostname!"
       alert(errStr)
       return false
    }
    
    return true;
	}
	
function ScaleSize(idTag, w, h)
{	
	var ctl = document.getElementById(idTag);
	
	if (ctl != null) {
  	if (w != 0) document.getElementById(idTag).width = w; //document.body.clientWidth;
  	if (h != 0) document.getElementById(idTag).height = h; //document.body.clientHeight;
	}
}

function deletePage(pageid)
{
	var agree = confirm("Weet u zeker dat u deze pagina wilt verwijderen?");
	if (agree) {
		location.href = '/index.php?a=mobpage_del&pageid=' + pageid;
		return true;
	}
	else return false;
}

function openColorpicker()
{
	var options = 'width=450,height=450,scrollbars=yes,toolbar=no,location=no,status=no,menubar=no,directories=no,resizable=no';
	var url = 'http://www.moblogs.nl/mycolors.html';
	var win = window.open(url, 'Colorpicker', "'" + options + "'");
	if (win == null) {
		alert('Pop-ups worden geblokkeerd!'); 
		//top.location.href = url;
	}
	return false;	
}

function validateMobPage()
{
	var ctl = null;
	
	ctl = document.getElementById('title');
	if (ctl != null) 	
		if ((ctl.value == null) || (ctl.value == '')) { alert('Vul een titel in a.u.b.'); return false; }
			
	ctl = document.getElementById('content');
	if (ctl != null) 
		if ((ctl.value == null) || (ctl.value == '')) { alert('Vul een tekst in a.u.b.'); return false; }
		
	return true;
}