Introduction to the use of js open() and showModalDialog() methods_javascript skills

//w: width, h: height, url: address, tag: tag
function showWin(w, h, url, tag) {
var t = (screen.height - h) / 2; / /Distance from top
var l = (screen.width - w) / 2; //Distance from left
window.open(url, tag, "width=" w ",height=" h ",top =" t ",left=" l ",location=0");
}
//Path address, window object, width, height
function open_Dialog(url, win,Width, Height) {
var return_Value;
var iTop2 = (window.screen.availHeight - 20 - Height) / 2;
var iLeft2 = (window.screen.availWidth - 10 - Width) / 2;
var height2 = Height - 50;
if (document.all && window.print) {
return_Value = window.showModalDialog(url, win, "dialogLeft:" iLeft2 "px;dialogTop:" iTop2 "px;dialogWidth: "
Width "px;dialogHeight:" Height "px;center:yes;status:no;scroll:no;help:no;");
}
else {
window.open( url, win, "top=" iTop2 ",left=" iLeft2 ",width=" Width "px,height=" height2
"px,resizable=0,scrollbars=0,location=0");
}
}