// JavaScript Document

function reveal(){
	document.getElementById('canvas').style.visibility = 'visible';
}

function delayed_reveal(){
	setTimeout('reveal()',1250);
}

function getWindowHeight(){
	var windowHeight = 0;
	if(typeof(window.innerHeight) == 'number'){
		windowHeight = window.innerHeight;
	}
	else{
		if(document.documentElement && document.documentElement.clientHeight){
			windowHeight = document.documentElement.clientHeight;
		}
		else{
			if(document.body && document.body.clientHeight){
				windowHeight = document.body.clientHeight;
			}
		}
	}
	return windowHeight;
}

function set_window_position(){
	if(document.getElementById){
		var window_height = getWindowHeight();
		var y = (932 - window_height) / 2;
		if(window_height < 932){
			window.scrollTo(0,y);
		}
		if(window_height > 600){
			document.body.style.overflow = "hidden";
		}
	}
}

function reset_window_position(){
	if(document.getElementById){
		var window_height = getWindowHeight();
		var y = (932 - window_height) / 2;
		if(window_height < 932){
			window.scrollTo(0,y);
		}
		document.body.style.overflow = "scroll";
	}
}

var click_count = 0;

function clear_textbox(){
	if(click_count == 0){
		document.forms[0].elements["Message"].value = "";
	}
	click_count ++;
}

function MM_validateForm() {
  if (document.getElementById){
    var i,p,q,nm,test,num,min,max,errors='',args=MM_validateForm.arguments;
    for (i=0; i<(args.length-2); i+=3) { test=args[i+2]; val=document.getElementById(args[i]);
      if (val) { nm=val.name; if ((val=val.value)!="") {
        if (test.indexOf('isEmail')!=-1) { p=val.indexOf('@');
          if (p<1 || p==(val.length-1)) errors+='- '+nm+' must contain an e-mail address.\n';
        } else if (test!='R') { num = parseFloat(val);
          if (isNaN(val)) errors+='- '+nm+' must contain a number.\n';
          if (test.indexOf('inRange') != -1) { p=test.indexOf(':');
            min=test.substring(8,p); max=test.substring(p+1);
            if (num<min || max<num) errors+='- '+nm+' must contain a number between '+min+' and '+max+'.\n';
      } } } else if (test.charAt(0) == 'R') errors += '- '+nm+' is required.\n'; }
    } if (errors) alert('The following error(s) occurred:\n'+errors);
    document.MM_returnValue = (errors == '');
  } 
}