function isBlank(field)
        {
                if ((field.value=='') || (field.value == ' '))
                {
                        return true
                }
                else
                {
                        return false
                }
        }




        function checkmailchr(field)
        {
                var chars='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_@.-'
                var temp

                for (var i=0;i<field.value.length;i++)
                {
                        temp=field.value.substring(i,i+1)
                        if (chars.indexOf(temp,0)==-1)
                        {
                                field.select()
                                return false
                        }
                }
        }



        function isValidEmail(field)
        {
                if ((field.value.indexOf('@') != -1 ) && (field.value.indexOf('.') != -1))
                {
                        var symchars1 = '@'
                        var symchars2 = '.'
                        var tempcount1 = 0
                        var tempcount2 = 0

                        for (var i=0;i<field.value.length;i++)
                        {
                                if (symchars1 == field.value.substring(i,i+1))
                                {
                                        tempcount1 = i;
                                }
                                if (symchars2 == field.value.substring(i,i+1))
                                {
                                        tempcount2 = i;
                                }
                        }

                        if (tempcount1 > tempcount2)
                        {
                                field.select()
                                return false;
                        }
                }
                else
                {
                        field.select()
                        return false;
                }
                if (checkmailchr(field) == false)
                {
                        field.select()
                        return false;
                }
                return true;
        }


var win= null;
function NewWindow(mypage,myname,w,h,scroll,toolbar){
var winl = (screen.width-w)/2;
var wint = (screen.height-h)/2;
var settings ='height='+h+',';
settings +='width='+w+',';
settings +='top='+wint+',';
settings +='left='+winl+',';
settings +='scrollbars='+scroll+',';
settings +='toolbar='+toolbar+',';
settings +='resizable=yes';
win=window.open(mypage,myname,settings);
if(parseInt(navigator.appVersion) >= 4){win.window.focus();}
}

		function chknumber(field)
			{	
			var symchars = '.'
			var symchars2 = ','
			var temp
			for (i = 0;i < field.value.length;i++) {
				   temp=field.value.substring(i,i+1)
				if (((field.value.charAt(i)<'0') || (field.value.charAt(i)>'9')) && (symchars.indexOf(temp,0) ==-1) && (symchars2.indexOf(temp,0) ==-1)) { 
					return false;
						}
					}
					return true;
			}

function RefreshImage(valImageId) {
	var objImage = document.images[valImageId];
	if (objImage == undefined) {
		return;
	}
	var now = new Date();
	objImage.src = objImage.src.split('?')[0] + '?x=' + now.toUTCString();
}