function toggleBlock(block,divs){
   blockOff(divs);
   blockOn(block);
}
function blockOff(divs){
	var i=0;
	if(typeof(divs) == "string"){
		//turn off a single
		document.getElementById(divs).style.display = "none";
	}else{
		//turn off multiple layers
		for (var i = 0; i < divs.length; i++) {
		   document.getElementById(divs[i]).style.display = "none";
		}
	}
}
function blockOn(idBlock) {
	document.getElementById(idBlock).style.display = "block";
}
function visibleOff(divs){
	var i=0;
	if(typeof(divs) == "string"){
		//turn on a single layer
		document.getElementById(divs).style.visibility = "hidden";
	}else{
		//turn on multiple layers
		for (var i = 0; i < divs.length; i++) {
		   document.getElementById(divs[i]).style.visibility = "hidden";
		}
	}

}
function visibleOn(idBlock) {
	document.getElementById(idBlock).style.visibility = "visible";
}
//divs are the fields that are to be checked
count=0;
function validateForm(theForm,divs,msgdiv) {
	err = false;
    visibleOff(msgdiv);//turn of error div
	for(i=0;i<divs.length;i++){
       var div = divs[i];
	   visibleOff('err'+div);//turn off every div
	   if(div == 'email'){
			if(!isEmail(theForm[div].value)){
				err = true;
				var errdiv = 'err'+div;
				visibleOn(errdiv);
			}
	   }else{//check for empty
		   if(theForm[div].value ==""){
			    err = true;
				var errdiv = 'err'+div;
				visibleOn(errdiv);
		   }
	   }
	}
	if (err) {
	   visibleOn(msgdiv);
       return false;
    }
	count++;
	if(count==1){
	  return true;
	}else{
	  alert ("We are currently processing your request.");
	  return false;
	}
}

function isEmail (s){   
    var i = 1;
    var sLength = s.length;
    // look for @
    while ((i < sLength) && (s.charAt(i) != "@"))
    { i++
    }
    if ((i >= sLength) || (s.charAt(i) != "@")){
	 	return false;
	 }else{
	  i += 2;
	 }
    // look for .
    while ((i < sLength) && (s.charAt(i) != "."))
    { i++
    }
    // there must be at least one character after the .
    if ((i >= sLength - 1) || (s.charAt(i) != ".")){
	 	return false;
    }else{
	 	return true;
	}
}
function popImage(img,x,y){
	unique = new Date();
	unique = unique.getTime();
	url = '/viewImage.php?imageName='+img;
 	paramlist = 'width='+x+',height='+y+',resizable=no,scrollbars=no,status=no,titlebar=no,menubar=no';
	newWindow = window.open(url,unique,paramlist);
	newWindow.focus();
}