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];}
}
function stringCheck(str){
	if(str==""){
		var m="Missing Image Name";
		return m;
	}
	else {
		//remove whitespace
		str=str.replace(/^\s*(.*?)\s*$/, "$1"); 
		var matchArray=str.match(/[^0-9a-zA-Z ]/g);	
		if (matchArray!=null) {
			var m="Invalid characters used";
			return m;
		}
	}
} 
//Validate form entries
function validate(){
	var idName="img";
	if(document.forms["bulletin_board"].elements["binFile"].value!=''){
		var msg=stringCheck(document.forms["bulletin_board"].elements["img"].value);
	}
	if (msg){
		document.getElementById(idName).style.color="#ff0000";
		alert(msg);
		return false;
	}
	else{
		if (document.forms["bulletin_board"].elements["binFile"].value!=""){
			var temp=document.forms["bulletin_board"].elements["binFile"].value;
			var temp=temp.substr(temp.length-3);
			if (temp!="jpg" && temp!="gif" && temp!="png"){
				idName="bFile";
				document.getElementById(idName).style.color="#ff0000";
				alert ("This file format is not supported!  Please find and image file in the stated file formats.");
				return false;
			}
		}
		else{
			document.getElementById(idName).style.color="#000000";
		}
	}
}