//dream weaver
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

//program js
// whitespace characters
var whitespace = " \t\n\r";


//Check whether string s is empty.
function isEmpty(s){
  return ( (s == null) || (s.length == 0) );
}

// Returns true if string s is empty or
// whitespace characters only.
function isWhitespace(s){
  // Is s empty?
  if ( isEmpty(s) )
    return true;

  // Search through string's characters one by one
  // until we find a non-whitespace character.
  // When we do, return false; if we don't, return true.

  for ( var i=0; i<s.length; i++ ){
    // Check that current character isn't whitespace.
    var c = s.charAt(i);

    if ( whitespace.indexOf(c) == -1 )
      return false;
  }

  // All characters are whitespace.
  return true;
}


// Checks to see if a required field is blank.  If it is, a warning message is displayed...
function ForceEntry(objField, FieldName){
  var strField = objField.value;

  if ( isWhitespace(strField) ){
    alert("You need to enter information for ( " + FieldName + " ) as this is a required field.");
    objField.focus();
    return false;
  }

  return true;
}

function validateSearchForm(){

	if( isWhitespace(document.busSearchForm.what.value) && isWhitespace(document.busSearchForm.who.value)  && isWhitespace(document.busSearchForm.where.value) ) {
	    alert("You need to enter information for atleast one of the search criteria.");
   	 document.busSearchForm.what.focus();
    	 return false;
	}else {
			if(document.busSearchForm.what.value != ''){
			  	if( (document.busSearchForm.what.value ).length < 3 ){
				  	alert("U dient minimaal 3 karakters in te geven");
					return false;
				}
			}

			if(document.busSearchForm.who.value != ''){
			  	if( (document.busSearchForm.who.value ).length < 3 ){
				  	alert("U dient minimaal 3 karakters in te geven");
					return false;
				}
			}
	}
	return true;
}