var IE = (document.all) ? 1 : 0;
var DOM = 0; 
if (parseInt(navigator.appVersion) >=5) {DOM=1};

        function txtShow( cId, txt2show ) {
            // Detect Browser
            if (DOM) {
							var viewer = document.getElementById(cId);
              viewer.innerHTML=txt2show;
            } else if(IE) {
               document.all[cId].innerHTML=txt2show;
            }
        }//txtshow
        
        function getTxt( cId ) {
            var output = "";
            // Detect Browser
            if (DOM) {
		var viewer = document.getElementById(cId);
		output = viewer.value;
            }
            else if(IE) {
                output = document.all[cId].value;
            }
            return output;
        }//getTxt

			function countChars(cBoxName, cTxtName, maxKeys) 
			{
				var str = new String(getTxt(cBoxName));
				var len = str.length;
				var showstr = '<span class="alert-pos">' + len + ' characters of ' + maxKeys + ' entered</span>';
				if (len > maxKeys) showstr = '<span class="alert">' + len + ' characters of ' + maxKeys + ' entered</span><br /><span class="alert">Too many characters, please edit content</span>';
				txtShow( cTxtName, showstr );
			}
			
			function ValidChars(sText,ValidChars) {
				var IsNumber=true;
				var Char;
				for (i = 0; i < sText.length && IsNumber == true; i++) { 
					Char = sText.charAt(i); 
					if (ValidChars.indexOf(Char) == -1)  {
						IsNumber = false;
					}
				}
				return IsNumber;
			}

	
	function checkform (form) {

		if (form.image_file.value == "") {
		 alert( "Please select an image to re-size" );
		 form.image_file.focus();
			return false;
		}
		if (form.max_pixels.value == "") {
		 alert( "Please select a maximum dimention for your image" );
		 form.max_pixels.focus();
			return false;
		}
		if (!ValidChars(form.max_pixels.value,"0123456789")) {
		 alert( "Please enter only numbers for the maximum dimention" );
		 form.max_pixels.focus();
		return false;
		}
	}