// Form verification
// A function that returns true if a string only contains whitespace characters
function isblank(s){
		for(var i=0; i<s.length; i++){
				var c=s.charAt(i);
				if ((c!='')&&(c!='\n')&&(c!='\t'))return false;
		}
		return true;
}
// Email verification function
function checkEmailb(F) {
if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,4})+$/.test(F.Email.value)){
F.submit(); return (true);
}
alert("Invalid E-mail Address! Please re-enter.")
return (false);
}
// Email verification function
function checkEmail(f) {
if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,4})+$/.test(f)){
  return (true)
  }
  //alert("Invalid E-mail Address! Please re-enter.")
  return (false)
}
// The function that performs form verification, invoked from onSubmit().
// The handler should return the value this function returns.
function verify(f){
		var msg;var empty_fields="";var errors="";
		// Look for form elements without the "optional" property. 
		// Then check for and list empty fields. Put together error messages.
		for(var i=0; i<f.length; i++){
				var e=f.elements[i];
				if (((e.type=="text")||(e.type=="textarea"))&&!e.optional){
						// first check if field is empty
						if ((e.value==null)||(e.value=="")||isblank(e.value)){
								empty_fields+="\n          "+e.name;
								continue;
		  }	}
    if (e.name=="Email"){
    // check the email address is valid
      if (checkEmail(e.value)==false){
        errors+="Invalid E-mail Address! Please re-enter.";
  }	} }
  // If there are errors, display them, and return false to stop form submission.
		if ((!empty_fields)&&(!errors))return true;
		msg="__________________________________________\n\n";
		msg+="This form was not submitted due to the following errors.\n";
		msg+="Please correct these errors and re-submit.\n";
		msg+="__________________________________________\n";
		if(errors){
				msg+="\n- "+errors;
		}
  if(empty_fields){
				msg+="\n\n- These required fields are empty:\n"+empty_fields;
		}
   alert(msg);return false;
}


function swap(image) {
	document.getElementById('largeimage').src = "images/sampler/display"+image+".jpg";
}

function findPosY(obj)
  {
    var curtop = 0;
    if(obj.offsetParent)
        while(1)
        {
          curtop += obj.offsetTop;
          if(!obj.offsetParent)
            break;
          obj = obj.offsetParent;
        }
    else if(obj.y)
        curtop += obj.y;
    return curtop;
  }
  
 function windowSize() {
  var myWidth = 0, myHeight = 0;
  if( typeof( window.innerWidth ) == 'number' ) {
    //Non-IE
    myWidth = window.innerWidth;
    myHeight = window.innerHeight;
  } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    //IE 6+ in 'standards compliant mode'
    myWidth = document.documentElement.clientWidth;
    myHeight = document.documentElement.clientHeight;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    //IE 4 compatible
    myWidth = document.body.clientWidth;
    myHeight = document.body.clientHeight;
  }
  return myHeight;
}
 
function positionfooter() {
	
	footer = document.getElementById('footer');
	footerpos = findPosY(footer);
	windowh = windowSize();
	
	if (footerpos < (windowh-40)) {
		floatbottom = document.getElementById('footer');
		floatbottom.style.position ='absolute';
		floatbottom.style.bottom ='0';
		floatbottom.style.left ='0';
	}

}