/**********************************************

 LMCore.js

 Basic ActiveCampus JavaScript functions including

    imageswapper, popup, external site frame, and quicklinks

 Author:  M. Dempster 3/2/01

 Copyright:  LiquidMatrix Corp.

**********************************************/



/**********************************************

 Browser control variables  

 These variables determine which browser is being used

**********************************************/ 

var isNav = (document.layers) ? true:false				//Layers compliant browser (Netscape 4.x)

var isIE = (document.all) ? true:false				//IE4/5 compliant browser 

var isDOM = (document.getElementById) ? true:false	   	//DOM Compliant browser (NS6, Opera 5)

var isOther = (!isNav&&!isDOM&&!isIE) ? true:false				//Other browser (NS3, Lynx)



/**********************************************

 Global Variables  

 Variables used in ALL pages, or by multiple JS functions

**********************************************/ 

var preloadFlag = false 								//Determines if images for swapping in page are loaded



/**********************************************

 newImage(stringexp)    

 Description:  Creates an image object containing the file found at arg

**********************************************/ 

function newImage(arg) {

	if (document.images) {

		rslt = new Image();

		rslt.src = arg;

		return rslt;

	}

}



/**********************************************

 changeImages([stringexp, (obj2|str2)])    

 Description:   Replaces image found at reference stringexp with specified image obj2 or str2.  Image may

 				may be pulled from an Image Object (eg: Imageobj.src) or a string (eg: "/images/x.gif").

 Tips:  You may use any number of argument pairs to swap multiple images at the same time.  Arguments MUST be 

  		paired;  args not paired will result in an error.

**********************************************/ 

function changeImages() {

  	if (document.images && (preloadFlag == true)) {

		for (var i=0; i<changeImages.arguments.length; i+=2) {

			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];

		}

	}

}



/**********************************************

 createReference(stringexp)    

 Description:   Creates a string reference to the style of an HTML element on the page.  Since each browser does Obj 

 				referencing differently, we have to branch it.

**********************************************/ 

function createReference(Element) {

	if (isDOM && !isIE) {

		oRef = eval("document.getElementById('" + Element + "').style")

	} else if (isNav) {

		oRef = eval("document.layers['" + Element + "']")

	} else {

		oRef = eval("document.all." + Element + ".style")

	}

	return oRef

}



/**********************************************

 jumpto(formobj, stringexp)

 Description:   Takes the value of the selected item in selector name, and forwards browser to that value.  

 				During the forward process, it resets the selector to default (index=0)

 Tips:  Normally, form is passed this.form, which is a generic reference to the form enclosing name

**********************************************/ 

function jumpto(form, name) {

	var myindex= eval('form.'+ name + '.selectedIndex');			//Gets index of user selection in Stringexp

    var myval=eval('form.' + name + '.options[myindex].value');		//Gets value at myindex

    eval('form.'+ name + '.selectedIndex = 0');						//Resets selected index to 0 (default)

	if (myval != "") {

        

	     location.href=myval;									//If value is local, send this window to new page.

       

    }

}





/**********************************************

 popup(stringexp, stringexp, integer, integer, stringexp, stringexp, )

 Note:  All vars are type STring and are required

 Description:   Pops open new window with parameters specified above.

**********************************************/ 

function popup(url, name, wwidth, wheight, wresize, wscrolls){

    eval("window.open('" + url + "','" + name + "','toolbar=no,menubar=no,address=no,status=no,dependent=no,resizable=" + wresize + ",scrollbars=" + wscrolls + ",height=" + wheight + ",width=" + wwidth + "')");

}





/**********************************************

 external(stringexp)

 Description:   Takes the value of URL, and creates a new window containing the External site frame, which displays the address specified

**********************************************/ 

function external(url){

    eval("window.open('/external.asp?URL=" + escape(url) + "','ACEXT','toolbar=yes,menubar=yes,address=yes,status=yes,dependent=no,resizable=1,height=540,width=760')");

}





/**********************************************

 autojump(formobj,formobj,stringexp,integer)

 Description:   On keypress in thisfield, tests to see if the length of the data entered is longer than maxlen.

 				If so, switch focus to fieldname.

 Tips:  Normally, formname and thisfield are passed "this.form" and "this" respectively, referencing the currently selected control and form.

**********************************************/ 

function autojump(formname, thisfield, fieldname, maxlen) {

	maxlen = (isNav) ? maxlen - 1:maxlen						//If NS4.0, length needs to be truncated by 1

	if (thisfield.value.length >= maxlen) {						//On keypress, if value is longer than maxlen

		formname.elements[fieldname].focus();					//Focus on fieldname

	}

}





/**********************************************

 adjustIFrameSize(windowobj)

 Description:   This function, when called from the onload handler of an iframe will resize that iframe to the height and width of it's current content.

 Tips:  This function is called as parent.adjustIFrameSize(window) from the iframe to be resized.

**********************************************/ 

function adjustIFrameSize (iframeWindow) {

  if (iframeWindow.document.height) {

    var iframeElement = parent.document.getElementById(iframeWindow.name);

    iframeElement.style.height = (iframeWindow.document.height+2) + 'px';

    iframeElement.style.width = iframeWindow.document.width + 'px';

  }

  else if (document.all) {

    var iframeElement = parent.document.all[iframeWindow.name];

    if (iframeWindow.document.compatMode &&  iframeWindow.document.compatMode != 'BackCompat') 

    {

      iframeElement.style.height = iframeWindow.document.documentElement.scrollHeight + 'px';

      iframeElement.style.width = iframeWindow.document.documentElement.scrollWidth + 'px';

    }

    else {

      iframeElement.style.height = iframeWindow.document.body.scrollHeight +  'px';

      iframeElement.style.width = iframeWindow.document.body.scrollWidth + 'px';

    }

  }

}